ITEM NAME:6pcs Guitar Tuning Pegs Tuners Machine Heads Replacement Button Knobs A#S Product Description Description: Specifications: Color: white pearl Material: plastic Size: small oval concave handle, the widest width of 18mm Mounting hole size: approx. 3.8mm-4mm (L * W) (Not the shape of the rules) Included: 6 X Guitar Tuning Pegs Knobs 6 X Mounting Screws 12 X Gaskets.Included: 6 X Guitar Tuning Pegs Knobs. If item is defective after 3 months, you can still send it back to us. We will send you a new one after receiving the defective item. Material: plastic. 6 X Mounting Screws.