Dodge Single Groove Sheave, Type C1, QD Bore Type, 7/16 to 2 in Bore Dia, 10.6 in Outside Dia, 10.55 in, 3/4 in Face Width, SDS Bushing, 1.33 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