The Milwaukee 48-66-3080 is a 3/8 in. Chuck Key, a replacement tightening key for Milwaukee corded drills and drill presses with a keyed 3/8 in. drill chuck that needs a chuck key for bit installation and removal. Keyed drill chucks use a rack-and-pinion mechanism that the chuck key's bevel gear engages and turns to tighten or loosen the chuck's three jaws evenly around the bit shank. The key's bevel gear engages holes around the chuck's circumference, and the key handle gives the mechanical leverage to tighten the jaws to the clamping force needed for secure bit retention while drilling. Without the chuck key, bits cannot be changed in a keyed chuck. Because the key is required for every bit change on keyed chuck drills, a replacement is needed right away when the original is lost or damaged.
- 3/8 in. chuck key for Milwaukee keyed 3/8 in. drill chucks, required for every bit change
- Bevel gear sized and matched to 3/8 in. chuck gear geometry for correct engagement
- Quality steel construction for durability through professional tightening cycles
- T-handle gives a comfortable grip and adequate mechanical advantage for tightening
- Always remove from the chuck before starting the drill; leaving it inserted is a serious safety hazard
