What is This?Turn switch knob is used to replace old or broken socket turn knob on the lamp. Widely used in table lamp, floor lamp, wall lamp, hanging lights.What will I get?Material: BrassColor: BlackTotal Size: 20mm x 15mm / 0.79" x 0.59"(L*D)Thread Size: 4/36Package Contents: 3Pcs x Turn KnobAre there any advantages of the product?The extension knob is made of brass, durable and stable. Easy to install, no tools needed for installation.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 turn off the power before replacing or repairing the lamp. Pay attention to the direction of rotation when installing the knob