This Chuck is NOT for the discontinued Drill Doctor set (DD500/750). Designed for use with the Drill Doctor Model No. 500X.
Drill Doctor/Darex - Large Bit Chuck For 750X DA70100PF
Drill Doctor
Drill Doctor DD750X Drill Bit Sharpener
V-390 Chuck with Slot, 1/8–3/4 - Replacement - DAREX
Drill Doctor 750X Review - Shop Floor Talk
Darex Precision End Mill Sharpener, 240V, 1.5 - 52Mm Capacity
Drill Doctor 750X Review - Shop Floor Talk
The DD500X is designed for durability and has the flexibility required to sharpen the largest range and most popular sizes of dull or broken bits-including split points and masonry bits. The DD500X will split points creating a self-centering bit for less drill bit wandering. Will sharpen both 118 and 135 degree point angles.
Drill Doctor DD500X Drill Bit Sharpener
DAREX Drill Doctor 750X FirstLook