Product Name: Rheostat Control the electrical resistance of a circuit without interrupting the flow of current. The rheostat consists of a ceramic core and a resistive wire wound into a toroid coil with a wiper axle. It can be widely used as a light dimmer and for motor speed control, suitable for applications such as arcs, pumps, fans, blowers, respirators, dental equipment, model trains, and other devices requiring high voltage and current. Material: Ceramic, Metal Color: As shown Power Rating: 100 W Resistance Value: 100 Ohm Mounted Hole Diameter: 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 / 3.1" x 1.4" (Max.D*) Net Weight: 250g Package Content: 1 x Rheostat Note: Lighting and different displays may cause slight variations in the color of the item compared to the real thing. Measurement allows an error of +/- 1-3cm.