A spinner handle is a shaft with a drive fitting that allows one to use a single handle with a number of different socket sizes. It does this by having an interface for attaching interchangeable sockets. What is the purpose of a spinner handle? Before a spinner handle, you would have to carry around a variety of socket drivers for each nut or bolt that you needed to tighten or loosen. With the advent of a spinner handle, however, one can save time and effort by using only one handle to do all the work!