Rigid Hitch Pair of 5-Bolt On 4-1/2 Inch Hub Assembly (AKRD-2000545) Includes (2) 1 Inch Straight Spindles & Bearings Pair of 1" straight spindles includes castle nuts and cotter pins. Bearings included - (4) L-44643 1" 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 ROUND 1-1/4" stock diameter with a bearing surface of 1 inch.