Product Name: Rheostat Control the electrical resistance of a circuit without interrupting the flow of current. The rheostat features a ceramic core with a resistive wire wound into a toroid coil and includes a wiper axle. Widely used as a light dimmer or for motor speed control, it is 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 in Bottom Screw Diameter: 2.5mm / 0.1 in Bottom Base Diameter: 72mm / 2.8 in Shaft Size: 37 x 6mm / 1.5 in x 0.24 in (L*D) Body Size: 80 x 36mm / 3.15 in x 1.42 in (Max D*) Net Weight: 250g Package Content: 1 x Rheostat Note: Lighting and monitor settings may cause slight color variations from the actual product. Measurement error is +/- 1-3cm.