What is This?The lamp knob replacement is used to replace old or broken socket turn knob, lamp switch knob suitable for most desk lamps on the market. Widely used in table lamp, floor lamp, wall lamp, hanging lights.What will I get?Material: Brass; Aluminium Alloy;Color: Gold;Total Size: 51.5mm x 22.9mm/2 x 0.9 inch(L*D);Thread Size: 3mm/0.12 inch;Head length: 43.3mm/ 1.7 inch;Extend rod length: 18mm/0.71 inch;In the package of: 4Pcs x lamp turn knob replacement.Are there any advantages of the product?The extension knob is made of brass, durable and stable. The lamp repair parts are easy to install, no tools needed for installation, just screwed it on, lamp can be turned on and off easily and smoothly.