Uxcell a13122600ux0207 2Pcs 500K Ohm Single Linear Taper Potentiometers with on/off Switch (Pack of 2) Product Name : Switch Carbon Potentiometer; Model : WH138; Technology : Carbon Composition Rated Power : 0.2W/0.1W; Resistance Value : 500K ohm; Shaft Diameter : 6mm / 0.24" Shaft Length : 13.5mm / 0.53"; Base Height : 18mm / 0.71"