The basic profiles of V-belt pulleys are:
SPZ - for belt profile SPZ, XPZ, 3V, 3VX, Z, ZX
SPA - for belt profile SPA, XPA, A, AX
SPB - for belt profile SPB, XPB, 5V, 5VX, B, BX
SPC - for belt profile SPC, XPC, C, CX
The belt is clamped on the shaft by means of a bushing. The clamping sleeve with the outer cone on which the pulley is mounted is fastened with two screws that keep the pulley in the correct axial position. The inner hole of the case, which is also with a groove for the pen, can be selected from several given dimensions.