This high torque 12 Volt automotive-style feeder motor is dirt and debris resistant. It operates at approximately 1,800 RPM and has a 1/4" shaft diameter that is 1" long and D shaped. Mounting screws are 2 5/16" apart. There is a flat plug on the wiring for use with the Universal Wiring Harness that we sell. If you don't need the flat plug connector, simply snip it off for a direct-wire application. The top has a slight bell shape near the shaft.