Black Electric Guitar Single Coil Pickup Cover With 1 Volume 2 Tone Knobs Switch Tip (Black) Knob: about 6mm knurled inner diameter Material: solid ABS plastic Fits for electric guitar . For Size:the Cover has three size, 48mm. 50mm,52mm Package Includes: 3 x Guitar Single Coil Pickup Cover(please inform us the size you need, or we will send 1x48mm,1x50mm,1x52mm as default) 3 x Knob(2T1V) 1 x Switch Tip