Dodge Sheave, Block Type A1, Taper-Lock Bore Type, 7/16 to 1-11/16 in Bore Dia, 4.12 in Outside Dia, 4.07 in, 4 Grooves, 1.91 in Face Width, SH Bushing, For Use With: 3V Cross Section Belts, Cast Iron, Gray Isolates shock loads and vibrationMinor misalignment capabilityDrive ratios of 6:1 or more possibleLow maintenanceNo lubrication requiredTypically 95% efficiency can be obtained