... bushings SPZ, SPA, SPB, SPC; Up to 10 grooves B) Adjustable speed V-belt pulleys and variable speed pulleys C) Flat ... AK, AKH, 2AK, 2AKH, BK, BKH, 2BK, 2BKH, 3BK E) Adjustable sheaves poly V-pulley, multi-pitch H, L, J, K ... , zinc-plated 5) Standard toothed bars are also available. belt roller