Four Piece Stainless Steel Grinder 2.5"

Now: $169.99
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* Important: Please order by Monday, December 5 for guaranteed Christmas delivery!



  • 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 | 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.




47 Reviews

  • 5
    Simply an awesome piece!!

    Published by Devin on Dec 28th 2021

    This is an amazing machined piece for your flower! It has a clean finish, good heft, and functions super smooth.

  • 5
    Great grinder

    Published by Alan on Dec 23rd 2021

    I bought this grinder because it’s stainless steel. Easiest to clean. Easiest to grind without covers sticking . I like the fact that it’s not aluminum and I’m hoping safer to use. The grinder is beautifully designed and after a few months we of use , I still am Impressed. I have 3 other grinders that received top ratings at the usual review sites and I’m surprised that this model is so much better than the others I have used.

  • 5
    Cool grinder

    Published by Jacoby on Dec 18th 2021

    Very heavy and high quality feel and fit. Excellent grind size that works well with the volcano and for rolling. I love not worrying about aluminum in my flower.

  • 5

    Published by Duane Sprague on Nov 21st 2021

    Very happy, best grind, going to last forever

  • 5
    4 Piece stainless steel grinder 2.5"

    Published by Ned on Sep 1st 2021

    This is a superb grinder that goes way beyond simply excellent function. It is a work of machinist's art. Quality, function, fit, and finish are all truly phenomenal. The only thing I can imagine to improve it would be to make one out of titanium, which I would definitely buy. I cannot recommend this grinder highly enough.

  • 5
    Today I received my grinder, it is unlike any other grinder I have had till now. It is very easy to operate and works smoothly. I no longer need to use any power. I also would like to thank the Iaso team and especially Jamie for their endless pati

    Published by Diana on Aug 10th 2021

  • 5

    Published by Streetlife on Jun 17th 2021

    The quality and craftsmanship of this grinder is impeccable. Iaso is an amazing and professional small business that I'm very satisfied with.

  • 5
    Four piece steel grinder

    Published by Robb on May 26th 2021

    Most amazing grinder I’ve ever had, it’s heavy and sturdy. I will say that I wish the middle holding have was vertically deeper so I can fit more in it at a time. I feel like I won’t need a new grinder for a long long time and that makes me happy. Good job team.

  • 5

    Published by Kyleah on May 22nd 2021

    Perfect! It's not only beautiful with the custom engraving but also works like a dream!

  • 5

    Published by Derek Gagne on Feb 18th 2021

    freaking awesome. Every grinder should be steel and made with thick threads like this thing!! Ill be passing this along to my grand kids in 50 years.

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