Rigid Hitch Pair of 5-Bolt On 4-1/2 Inch Hub Assembly (AKSQ-2200545) Includes (2) Square Shaft 1-1/16 Inch Straight Spindles & Bearings Pair of 1-1/16" straight spindles includes castle nuts and cotter pins. Bearings included - (4) L-44649 1-1/16" inside dimension. Hubs have pre-installed pressed in races. Hub has a 5-bolt pattern on 4-1/2" bolt circle. Pilot diameter 2-1/2", flange diameter 5.56" and measures 4-1/4" tall (through center of hub) Spindles feature a 1-1/2" SQUARE stock diameter with a bearing surface of 1-1/16 inch.