Dodge Single Groove Sheave, Type C1, QD Bore Type, 7/16 to 1-11/16 in Bore Dia, 6-1/2 in Outside Dia, 6.45 in, 11/16 in Face Width, SH Bushing, 1.368 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