Superior Electric M1670-2 Aftermarket Replacement Chuck Assembly Service Kit Replaces Milwaukee P/N 48-66-1481 Replaces: 48-66-1481 - 1/2 inch Reversing Chuck Replaces: 06-75-3155 - 1/4 inch - 20 x 1 inch Socket Screw - L.H. Thread Replaces: 48-66-3280 Chuck Key