Dodge Single Groove Sheave, Taper-Lock Bore Type, 1/2 to 1-11/16 in Bore Dia, 6-1/2 in Outside Dia, 6.45 in, 0.69 in Face Width, 1610 Bushing, 1 in Overall Length, For Use With: 3V Cross Section Belts, Cast Iron Isolates shock loads and vibrationMisalignment capabilityLow maintenanceNo lubrication requiredQuiet operation motors, etc. are normally at a higher db level than V-drivesEfficiency of 95% is typical