Drill Doctor Models XP, 350X, 500X and 750X.
Sharpens 1/2" - 3/4" drill bits.
The wheel has three layers of nickel/diamond plating to provide long life.
If you sharpen mostly large bits (1/2" or larger), this sharpening wheel will sharpen your bits faster, with fewer turns.
DA31325GF 100 grit sharpening wheel.