V-belt Pulleys For Clamping Sets are bored to accept locking assemblies (RingFeder, TAS, KTR-type) instead of a keyway. The clamping set provides a keyless, backlash-free, high-torque connection with easy assembly and removal. Suitable for SPZ, SPA, SPB and SPC belts, they are used on heavy industrial drives, mining, quarry and process equipment demanding high torque density.