Home Products Hand Tools Chuck Keys Chuck Key 3/8-1/2″ Chuck Size 9/32″ Pilot Size Thumb Kk Chuck Key 3/8-1/2″ Chuck Size 9/32″ Pilot Size Thumb Kk (64506) Hardened tempered allow steel chuck key Thumb style handle 3/8-Inch to 1/2-Inch chuck size Find a Retailer Find on Amazon