Replace old or broken socket turn knob on bulbs and lamps. Widely used in table lamp, floor lamp, wall lamp, hanging lights.Total Size: 50mm x 10.6mm / 1.97" x 0.42"(L*Max.D); Thread Diameter: 3mm / 0.12"The extension knob provides greater leverage, making it easier to turn the switch.Turn counterclockwise to remove the old knob, then screw the new knob clockwise onto the lamp holder.Please cut off the power before replacement. What is this? Replace old or broken socket turn knob on bulbs and lamps. Widely used in table lamp, floor lamp, wall lamp, hanging lights. What will I get? Material: Plastic Color: Black Total Size: 50mm x 10.6mm / 1.97" x 0.42"(L*Max.D) Thread Diameter: 3mm / 0.12" Package Content: 6Pcs x Turn Knob Are there any advantages of the product? The extension knob provides greater leverage, making it easier to turn the switch. How to use it? Turn counterclockwise to remove the old knob, then screw the new knob clockwise onto the lamp holder. What should I notice? Please cut off the power before replacement.