Yes, this is a speed reducer --powered by a 1/4" drill, the other end has a tapered shaft, .625 at the large end and about .600 at the small end, for attaching a supplied 1/2" chuck, mfd by Supreme Chucks, which I see on another website was/is in Chicago. Also the shaft has a hole which can receive a stepped 1/4" shaft. Other supplied accessories are various screwdriver bits and an adapter for 1/4" sockets. The reducer in the forward direction is about 7:1, and by moving & twisting the output shaft out, it will drive things in reverse at 6:1. Sears didn't have it in their computer as of last week.