Diamond grinding head (1")

SKU: 40299


Recognized worldwide as the benchmark for quality and value, our 1″ (25 mm) diamond grinding heads provide faster grinding, more grinding surface and more usable diamond. Available in a wide range of grits, they can be used wet or dry to grind and shape a wide range of products for hobby and home projects.

Because we plate our own diamond products, we can offer the absolute best drums at better prices than anyone else. The diamond coating on your Inland diamond grinding head will never peel from the drum, or we'll replace it for free for the life of the diamonds. You will never need to knock off the "bunchings" on an Inland bit—we don't call them bunchings, we call them defects—and our quality control system eliminates them.

Key features

  • More usable diamond makes them longer lasting; the larger diameter affords faster grinding and more grinding surface
  • Brass cores are manufactured on Swiss precision machinery for consistent and accurate tolerances; look for the distinctive precision quality rings
  • Color banding for easy at-a-glance grit identification
  • All Inland diamond grinding heads are measured for trueness before any diamond is applied. This insures that every drum will spin properly on the motor shaft
  • Use wet for shaping all types of stone, glass, tile, and other mineral based materials for home and hobby projects
  • Use dry to sand, shape, and finish a variety of plastics and woods for home and hobby projects
  • Our bits fit all American and German-made glass grinders and some Chinese models as well


  • Fits 0.312" (7.92 mm) arbor
  • TIR <.0025" (.0635 mm)
  • CDA 360 brass cores
  • 0.625" (15.88 mm) high diamond surface
  • Also known as WB-9


Customer Reviews

Based on 17 reviews
Suzanne Lossing
Diamond grinding head received

I have not tried my diamond grinding head (1") yet. Received in a timely manner and safely packaged. Thank you.

Jerry Jones

Used it twice. So far it’s working very well. Be interesting to see how long it goes.

Sarah Wandrey
I think I got the wrong bits

I ordered speed grinder bits (80#). Both packages said the right thing, but they. It’s feel like 220# to me.

Hi Sarah - We are sorry to hear that the bits are not performing properly. We encourage you to contact us at (248) 583-7150 or info@inlandcraft.com so that we can make this right for you. Thanks and we look forward to hearing from you!

Eleonora Dinu
Stays kind of dry

I am not sure if I am missing something but this grinder stays pretty dry. I ordered it because I thought it was supposed to not need a sponge to draw up water from the reservoir. But maybe that was just wishful thinking.

Hi Eleonora - We believe that you are referring to the invisible sponge bitsert. We encourage you to contact us at (248) 583-7150 or info@inlandcraft.com so that we can discuss further and provide some tips and tricks. Thanks and we look forward to hearing from you!

jack Soullier
Poor grinding bit performance

I've been an inland buyer for some 40 years. I will admit I've been extremely disappointed in the performance of my grinding bits over the last year. On three occasions my bits have worn away on the bit down to the metal. Three times in one year on something that never has happened in the last 38 years. I getting ready to make a change If this to happen again.

Hi Jack - We are sorry to hear that you are disappointed in our grinder bits lately. We would like to gain more feedback from you. If you are willing, we encourage you to contact us at (248) 583-7150 or info@inlandcraft.com so that we can discuss further and make this right for you.

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