Diamond grinding head (1/4")

SKU: 40298


Recognized worldwide as the benchmark for quality and value, our 1/4″ (6 mm) diamond grinding and drilling heads let you drill holes has well as grind and shape. Available in a several 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

  • Use for drilling holes and for grinding and shaping
  • Can be stacked on a larger 3/4" or 1" diamond grinding head
  • Small diameter especially suited for grinding in tight curves and detail shaping
  • 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
  • 0.50" (12.7 mm) high diamond surface
  • Also known as WB-8


Customer Reviews

Based on 24 reviews
Vicki Clawson

Can’t review the bits cause they don’t fit my grinder but customer service has always been good. I need to return them.

Marge Strother
Falling grinder

You sent me new set screws but the grinder still falls down no matter how tight I tighten the screws

Hi Marge - We are sorry to hear this. We encourage you to contact us at (248) 583-7150 or info@inlandcraft.com so that we can make it right for you.

Delbert Poggemeyer

so far so good

Magda Castro

Diamond grinding head (1/4")

David Thatcher
What I expected!

I haven’t used it yet, but by examining it I can see it is better than off brands l looked at for less.

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