Dodge Single Groove Sheave, Taper-Lock Bore Type, 1/2 to 2-11/16 in Bore Dia, 16.35 in Outside Dia, 15.98 in (A)/16.36 in (B) Pitch Dia, 1.13 in Face Width, 2517 Bushing, For Use With: A-B Cross Section Belts, Cast Iron Isolates shock loads and vibrationMisalignment capabilityDrive ratios of 6:1 or more possibleLow maintenanceNo lubrication requiredQuiet operation motors, etc. are normally at a higher db level than V-drivesEfficiency of 95% is typical