Foredom's momentary on and off foot switch is for use with the U.S.230 volt series SR motors as well as other stationary power tools including bench lathes, scroll saws, and drill presses. It allows you to sustain full speed in operation and permits the user to turn the tool and and off without using the manual switch. When using this item with a flexible shaft machine, plug in between variable speed control and the power source. While using it with the BL bench lathe, it will plug directly into the lathe. Rated 1/3HP, 6 amp max. motors. Comes with 18" cord with receptacle plug and 6' cord with 3-prong plug. Measures: 7-1/4" long x 4-1/2" wide x 2-1/2" high.