Llambrich CPM Keyless Drill Chuck with Locking Mechanism and Metal Sleeve, 3/8" x 24 UNF Mount, 1-37/64" Chuck Diameter, 1/32"-3/8" Capacity Keyless drill chuck with metal body, locking mechanism and carbide jaw-inserts With a locking mechanism, no key is required for closing or opening, for hammer drilling and also screwdriver operations Carbide jaw-inserts (for 13 mm. capacity) reduce bit slippage and enhance wear resistance Ergonomic and strong design with full metal sleeves in black oxide finish that eliminates the possibility of rust With through hole for clockwise and anticlockwise rotation