Features: Make from copper materials is rustproof and Enduring. Twist on easily. Just screwed it on, lamp can be turned on and close easily and smoothly. Great for Replacing old knobs; Repair a lamp Switches that missing lamp knobs. Suitable for most lamp, threaded for a common table lamp socket. Require no tool for installation. Simply twist them into place to operate your Lamp easily. Specifications: Materials: Copper Color: Black Color/Gold/Bronze/Silver Size: about 15x20mm/0.59x0.79inch Thread hole diameter: about 3mm/0.12inch Package Includes: 10Pcs Lamp Switches Knob note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.