1-piece, high-heat bakelite body for temperatures up to 150 degrees Celsius. Will stand temperatures up to 250 degrees Celsius on intermediate use. Switch built in/open screw terminals. Turn knob is non-removable. Overall length: 1-5/16 inches. Bushing length: 3/8-inch x 0.27-inch x 11/32-inch. Wire recommended for specific temperature as follows: AWM (plastic) wire - 105 degrees Celsius/221 degrees Fahrenheit, AF (asbestos) wire - 150 degrees Celsius/302 degrees Fahrenheit, SF (silicone) wire - 200 degrees Celsius/392 degrees Fahrenheit. UL (Underwriter's Laboratories) listed.