Four Piece Stainless Steel Grinder 2.5"

Now: $169.99
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  • Our biggest herb grinder, perfect for large doses and enjoying with friends
  • Constructed out of 100% Medical Grade Stainless Steel 
  • High quality 4 piece herb grinder made in the USA
  • Strong magnetic lid keeps the top and bottom 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

Pro Tip: Add gift packaging for a Vermont-Made novelty wood puzzle box that perfectly complements this large grinder for herb

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% medical grade 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% Medical Grade 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 smoking 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.




54 Reviews

  • 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 9th 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.

  • 5
    2.5” 4pc., 1.75” 4pc.

    Published by Edward Lee on Sep 14th 2022

    I have used both the 2.5” 4pc as well as the 1.75” 4 piece grinders on a daily basis for over a year now. That are as perfect now as the day I bought them, with zero maintenance during that time. Contrary to some posts I read on the internet prior to buying, the labyrinth seal system does NOT clog up, even with heavy, sticky buds and no cleaning. These grinders are a rare example of form meeting function. They do the job perfectly, while the superb machine work demonstrates the pride involved in their manufacture. They go everywhere with me, and I still get pleasure every time I use either one! Thank you Iaso!

  • 5
    Best grinder to date

    Published by Ollie on Aug 6th 2022

    I’ve used this grinder for about 3 months and I must say when I first went to buy the product I was a bit weary about paying the higher price but the quality of the metal , the grind quality and all in all the experience I get from it 11/10

  • 4
    4pc Grinder

    Published by Henry on Aug 6th 2022

    The top half of this grinder is engineered extremely well but the bottom half I think could use some attention particularly a deeper ground flower and a smaller kief chamber.

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