This is a 2-in-1 volume tone blend control buttons for electric guitar and bass, made of strong metal with nickle plating, the buttos ensure great durability. It can work with most electric guitar and bass, easy to install. workmanship will add touch to your instruments for its delicate design. Great accessory for electric guitar, electric bass to replace your broken, dirty or old control knobs. Features - Color: Golden - Material: Metal - size: Approx. 18 x 13mm / 0.7 x 0.51in ( H) - inner hole diameter: approx. 8mm / 0.31in - one size: Approx. 15 x 14mm / 0.59 x 0.55in - one inner hole diameter: Approx. 6mm / 0.24in - Dual knurled concentric knobs, strong metal shell with great endurance and durability. - Great replacement for your broken, dirty or old volume tone control knob. - Control the tone and volume on the same pot. To be used with the dual concentric pot. - Compatible with all most / / electric guitar or bass. - Fits 6MM import concentric pots and split shaft pots,no screw hole on the knob. Package list: 1 x Dual Concentric Knob 1 x Wrench