Dodge Single Groove Sheave, Type D1, Taper-Lock Bore Type, 1/2 to 1-1/4 in Bore Dia, 2.82 in Outside Dia, 2-3/4 in, 1.094 in Face Width, JA Bushing, 1.46 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