Check the listing for details. 200W 30R Wirewound Ceramic Potentiometer Variable Rheostat Resistor With Knob. Condition: New. Listed at 46.64 USD. Product Name: Wirewound Ceramic Potentiometer Resistance Value: 30R OhmPower:200WTolerance: +/-5%Terminals Number: 3Features: Round ShaftTotal Size: 104.5 x 80mm/ 4.12 x 3.15 inch (D * H)Screw Thread Dia: 10mm/0.39 inchShaft Diameter: 6mm/0.23 inchShaft Length(do not include the Screw Thread parts): 15.7mm/0.62 inchShaft Total Length: 32mm/1.26 inchPackage Content: 1 x Wirewound Ceramic Potentiometer Knobs Size: 18.8 x 30/ 0.74 x 1.18 inch(H*D)30R Ohm, 3 Terminals, Single Linear, Suits Most Standard Knobs.（this item include Knobs)Material：Ceramic MetalControl the electrical resistance of a circuit without interrupting the flow of current.The rheostat is consisted of ceramic core and a resistive wire wrapped to form a toroid coil with a wiper axle.