Product Name: Rheostat; Material: Ceramic, Metal Power: 50W; Resistance Value: 10 Ohm Mounting Hole Diameter: 9.5mm/0.37" Bottom Screw Diameter: 3mm/0.12"; Bottom Base Diameter: 57mm/2.3" Shaft Size: 40 x 6mm/1.6" x 0.24"(L*D); Body Size: 63 x 35mm/2.5" x 1.4" (Max. D*) Package Content: 1 x Rheostat Color: As Shown Net Weight: 160g Control the electrical resistance of a circuit without interrupting current flow. The rheostat consists of a ceramic core and a resistive wire wound to form a toroidal coil with a wiper shaft. Widely used as light dimmers and motor speed control, applicable for arcs, pumps, fans and blowers, respirators, dental and model railways, or other applications requiring high voltage and current. Note: Light and different displays may cause the color of the item in the picture to be a little different from the real thing. The measurement allowed error is +/- 1-3cm.