V1 - For common 3PDT standard size foot switches, 10mm diameter
V2 - For smaller, tap-tempo SPST style foot switches, 8.5mm diameter
BIG BORE - For larger 3PDT foot switches up to 11.1mm
Max Bore - For Extra Larger 3PDT foot switches, 13mm diameter (TC Electronics size)
Skirtless variants are for more low profile foot switches with a sho