All Dodge V-drive sheaves are manufactured to ISO 9002 quality standards with precision machining that meets or exceeds joint RMA/MPTA industry standards for smooth operation and extended belt life. This provides low economical costs per hp transmitted due to shock load and vibration isolation creating clean, quiet operation. Dodge Single Groove Sheave, Block Heavy Duty Type D1, QD Bore Type, 7/16 to 1-11/16 in Bore Dia, 4.775 in Outside Dia, 4.7 in Pitch Dia, 0.931 in Face Width, SH Bushing, 1-5/16 in Overall Length, For Use With: 3V Cross Section Belt, Gray Iron Isolates vibration, cushions shock loadsMinor misalignment capabilityDrive ratios of 6:1 or more possibleLow maintenanceNo lubrication requiredEfficiency of 93% is typical