When a particular phase relationship is required between two parts of a machine, the angle adjusting hub provides quick, accurate and positive phase adjustment. Without the angle adjusting hub, phase relationship of parts requires extremely accurate machining of components as one tooth of a sprocket or gear is usually too coarse an adjustment. Browning® Synchro-Angle Adjusting Hub, 3/4 to 2-1/16 in Bore, 6-1/4 in OD, 5-5/8 in Pilot Diameter, 4-3/8 in Diameter Bolt Circle, 3 Bolt Holes, 3-9/32 in Overall Length