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 , 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*) Net Weight : 250g Package Content : 1 x Rheostat Note:Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.