Four Piece Stainless Steel Grinder 2.5"

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  • Our biggest herb grinder, perfect for large doses and enjoying with friends
  • Constructed out of 100% Stainless Steel 
  • High quality 4 piece herb grinder made in the USA
  • Strong magnetic lid keeps the top and middle piece securely attached
  • Sharp teeth for an easy and smooth grinding experience
  • Knurled top and bottom piece for exceptional grip and comfort 
  • Specially-designed curved bottom chamber for easy gathering of herb and kief
  • Dishwasher safe and easy to clean and maintain 
  • 100% Money Back Guarantee and Limited Lifetime Warranty
  • FREE SHIPPING on orders $100+  | Ships in 3-5 business days

What’s Included:

  • One (1) large herb grinder 
  • One (1) 40 micron medium sift screen
  • For the 60 micron fine sift screen, add a request to your order notes during the checkout process


Our 4-Piece 2.5” Stainless Steel grinder is a favorite among our customers! After receiving so many positive reviews and experiences from our already proven 1.75” mini herb grinder, we wanted to create a larger version with the same quality and performance. This durable and sleek 4 part grinder is perfect for larger dosing and makes a positive impression on friends during a group sesh! Best Part? You can load more herb into the grinding chamber! 

The weight and feel of this big herb grinder is durable and heavy duty. Unlike aluminum grinders, it is constructed of 100% stainless steel, making it ideal for medical patients and anyone who has health concerns using aluminum products.  

This large grinder with a kief catcher is built with the same design methods and technology used in aerospace and renewable energy fields. It is high quality, guaranteed to perform and last a lifetime.

This 4 piece grinder features our Patent Pending labyrinth seal design. With our exclusive labyrinth seal solution, the top and middle pieces of the grinder are specially sealed together so your herb stays securely inside – no spills and no lost herb to worry about.

Create the perfect grind with just a few turns of the grinder. Sharp diamond-shaped teeth will cut and grind your herb with ease, and knurled top and bottom pieces save you from excessive wrist strain.

This four piece grinder includes a kief catcher or pollen catcher that functions as a storage compartment for collecting kief.


A kief screen is a type of sift screen used to separate ground herbs from kief. An ultra fine stainless steel mesh screen allows the trichomes to pass through to the bottom chamber, while the bigger herb pieces remain in the catch chamber.

Our 4 piece grinder with a kief catcher features a sift screen and catch chamber on the bottom to collect those potent trichomes that fall off during the grinding process. The stainless steel sift screens are removable, allowing you to choose between fine and medium micron sizes. 

You can sprinkle these trichomes on top of a bowl, in a joint, or use it in cooking and baking your favorite meals and treats! 

The bottom chamber may double as a stash container for ready-to-go ground flower. Elevate your experience by upgrading to the best large 4 chamber grinder!


  • Material: 100% Stainless Steel
  • Width: 2.5 (in)
  • Height: 1.8 (in)
  • Depth: 2.5 (in)

► For a smaller 4-Piece Grinder, order our 4 Piece Stainless Steel Grinder 1.75"

► For a large grinder without a kief catcher, order our 3 Piece Stainless Steel Grinder 2.5”

► Add accessories like a stainless steel storage container or a stainless steel chillum

If you have any questions or need any help, please visit our contact us page.




57 Reviews

  • 5
    2.5" Four Piece Stainless Steel Grinder 2.5"

    Published by Janet West on Jan 2nd 2024

    I love this grinder, it's the best! Works like a charm, it's fun to use, the quality of the grind is amazingly fluffy and light! It's made in the USA, and I like to purchase USA made products. Glad I found your company. To sum it up WOW!!!

  • 5
    4 Piece Stainless Steel Grinder

    Published by Ira on Dec 11th 2023

    This grinder is HEAVY!!!! I love that I have a grinder made in Vermont. Picked up 2 during the black friday sale and they didnt disappoint at all. Shipping in a small well crafted wooden box that was packed inside a box with the normal protection inside the box to protect the items inside. As for the grinder itself its heavy and very well constructed. Grinding with this is so easy even if you have a full grinder. A twist back and forth and the sharp STAINLESS STEEL teeth grind whatever is in the way stems and seeds included without hesitating. Effortless grind and I like it better than another high dollar "Slicer" that I purchase a few years ago. I had no idea that Aluminum is a neurotoxin until I heard about this great company that was right in the same county I live in. I'm hoping in the near future they come out with Stainless Steel downstems and bowls. I would much rather have stainless steel than aluminum. I have yet to find a stainless steel bowl and down stem. IASO what are you waiting for????

  • 5
    Beautiful Machine shop work!!!

    Published by William Transue on Dec 2nd 2023

    Beautiful machining out of squeal steel (stainless). Triple parallel threads make for a 1/3 turn to tighten threads and allows for 3 thread entry points. Hollow ground cutters for most efficient cutting…. Too many well thought features to list them all…. simply the best grinder I ever used. My big one has been heavily used for well over a year. I ordered a bigger screen a new friction gasket. I also have the smaller one that I use occasionally. The big one is as good as the day I put it into use. THANK YOU!

  • 5
    Nice Grinder

    Published by Unknown on May 15th 2023

    What I love about iaso first is the stainless steel and second and more important is that the grinder does not gum up and get sticky and hard to turn. I have both this big guy and the little one too and they are my go-to grinders now.

  • 5
    Master shredder

    Published by Troy on May 8th 2023

    Worth it! Puts every gas station grinder to shame. Buy once cry once

  • 5
    2.5 Steel grinder

    Published by Joesph William on Apr 18th 2023

    Absolutely awesome! Very easy in the hands far as grinding goes and very smooth as well , consistent medium grind fluffy grind every time!

  • 5

    Published by Phil on Mar 6th 2023

    These grinders are truly a work of art! I’ve been in manufacturing for 20 years and the attention to detail is unmatched. Not only did they design it for flawless functionality they used material (stainless) that is going to outperform and outlast anything else out there. I also have the smaller 4 piece and performs on the same level, but in the perfect size for on the go.

  • 5
    Four Piece Stainless Steel Grinder 2.5"

    Published by MH on Jan 3rd 2023

    Impressive. This is the perfect grinder. Bought a Four Piece Stainless Steel Grinder 2.5" for myself a few months ago. Loved it so much, I recently bought three to give as gifts. No toxic aluminum or pealing coatings to inhale, dishwasher safe, built to last. Buy one!! Highly, highly recommended. Thank you Iasogoods!!

  • 5
    Four Piece Stainless Steel Grinder 2.5"

    Published by MH on Jan 3rd 2023

    This is the perfect grinder. Bought one for myself a few months ago and loved it so much, I recently bought three to give as gifts. No toxic aluminum dust or pealing coatings, dishwasher safe, EXCELLENT customer service. Buy it!! Highly, highly recommended. Thank you Iasogoods!

  • 5
    I really like the grinder it was solid, and it work very professionally. I was very satisfied with it. It was worth the money, very quality.

    Published by Lawrence Lee on Sep 25th 2022

    Like I said, the grind is very quality is worth every bitter the money I recommend it to anyone who’s looking for a grinder. He gets the job done. Very satisfied. Lawrence Lee.