Thick Barrel with open ends. Front: 3/8" x 5" / 5-1/2" / 6", 32 / 36H x 12/14G. Rear: 3/8" x 6-1/2" / 7" / 7-1/2", 36 / 40H x 12/14G. Thread: 34.8mm x 24 TPI BSCY Lubricator hole & Clip to order. (Note : Front Hub also Available with 5/16" x 5.1/2" Axle) Axle Finish: ZP / Black / NP