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. It can be widely used as a light dimmer or for motor speed control, suitable for applications such as 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 / 3.1 in x 1.4 in (Max D*) Net Weight: 250g Package Content: 1 x Rheostat Note: Lighting and monitor settings may cause slight variations in color. Measurement error is +/- 1-3cm.