●Specifications Outer diameter of 23mm and inner diameter of 10mm for common 10mm effect pedal switches. ●Material The foot switch attachment is made of aluminum alloy, which is lighter and more wear-resistant. Inside there is a rubber sheath to increase the preload force to protect the step nail from polishing by screws. ●Increase Accuracy Convenience The original nail contact surface of the effect machine is relatively small, trampling is not so convenient, lock a pedal cap over the trample cap, so that the contact area is enlarged, just lift more handy. ●Installation: Press to fully press the switch while tightening the adjusting screws. ●Package Content 4 x Foot Switch Topper and Rubber Sheaths, 4 x Hex Wrench.