Product Name : Rheostat Control the electrical resistance of a circuit without interrupting the flow of current. The rheostat is consisted of ceramic core and a resistive wire wrapped to form a toroid coil with a wiper axle. Can be used widely as light dimmers and motor speed control, is applicable for arc lamps, pumps, fans and blowers, respirators, dental and model trains or other applications that require high voltage and current. Material : Ceramic, Metal Color : As Shown Power Rating : 100 W Resistance Value : 100 Ohm Mounted Hole Dia : 9.5mm/ 0.37" Bottom Screw Diameter : 2.5mm/ 0.1" Bottom Base Diameter : 72mm/ 2.8" Shaft Size : 37 x 6mm/ 1.5" x 0.24"(L*D) Body Size : 80 x 36mm/ 1.3" x 1.4" (Max.D*T) Net Weight : 250g Package Content : 1 x Rheostat Note:Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.