IKN 2T2V Knobs Black Top Hat Bell Plastic Guitar Tone Volume Speed Control Knobs for SG LP Style Guitar Replacement Use for LP Style SG Style electric guitar or other similar guitar volume tone knob Replacement. Top Diameter: approx. 18.5mm; Bottom Diameter: approx. 26.5mm. Central hole Diameter:approx. 6mm . Material: Plastic + aluminum sheet. Packge include: 4 pcs knobs( 2 Volume +2 Tone)