Grinding / drilling bit adapter

SKU: 40317


The easy way to drill precision holes and create fine details without having to remove your ¾” or 1″ grinding head! Works with our 1/8″ (3 mm), 1/4″ (6 mm) 3/8″(10 mm) diamond drill bits.

Drill precision holes and create fine details without having to remove your ¾" or 1" grinding head!

Key features

  • Standard 100# grit for multi-task use
  • Drill small holes quickly and easily
  • Use to grind and shape tight inside curves and fine detail in glass, stone, tile, marble, and similar materials
  • The brass cores are manufactured on "Swiss precision" screw machines for consistent and accurate tolerances
  • Measured for true before the diamond is applied, so they spin properly on the motor shaft


  • Fits .312" (7.92 mm) arbor
  • TIR <.0025" (.0635 mm)
  • This adapter is required to use individual drilling heads (SKU 40318, SKU 40314, SKU 40338)
  • Also known as WB-Adapter, and WB-317


Important purchasing note:  Color may vary

Customer Reviews

Based on 3 reviews

Grinding / drilling bit adapter

gary k
grinding glass

everything went perfect

Curt Gassmann
Grinding drill bit adapter

The adapter doesn't go down far enough on the grinder motor so only a small part of the drill bit is actually usable and the bit come loose on the adapter when using it.

Hi Curt - We are sorry to hear this and this should not be the case. Please call us at (248) 583-7150 so we can assist you further.

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