Guyker dual concentric control knobs are for sound equipment or rotary potentiometer, for protection and easy control. The switch knobs have a domed finish around their circumference. Benefits / Features: - Control the tone & volume on the same pot, it has screw hole on the knob. - Compatible with most electric guitars / bass. - Easy replacement or upgrade. Specifications: - Base one size: Approx.19mm / 0.75 in (Width); - Base inner shaft hole diameter: approx. 8.3mm / 0.33 in. - Top one size: Approx. 16mm / 0.63 in (Width); - Top inner shaft hole diameter: Approx. 6.2mm / 0.24in - Total Height: Approx. 20mm / 0.79 in. - 5 Color available: chrome, black, gold, red, blue - Style No.: CKB-002.
