Product Name: Rheostat Control electrical resistance in a circuit without interrupting the flow of current. The rheostat consists of a ceramic core and a resistive wire wound to form a toroidal coil with a wiper arm. Widely used as a light dimmer and motor speed regulator. Suitable for arcs, pumps, fans, blowers, respirators, dental and model railways, or other applications requiring high voltage and current. Material: Ceramic, Metal Color: As Shown Power: 100 W Resistance Value: 100 Ohm Mounting Hole Diameter: 9.5 mm/0.37 inch Bottom Screw Diameter: 2.5 mm/0.1 inch Bottom Base Diameter: 72 mm/2.8 inch Shaft Size: 37 x 6 mm/1.5 inch x 0.24 inch (L*D) Body Size: 80 x 36 mm/1.3 inch x 1.4 inch (Max.D*T) Weight: 250g Package Contents: 1 x Rheostat Note: Light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3 cm.