DLLL A Pair Of Road Mountain Bike Bicycle Cycling MTB Wheel Hub Front&Rear Skewers Quick Release Clip Bolt Lever Axle QR 145/185mm Axle diameter: about 4.5mm;Front Skewer Size:145mm;Rear Skewer Size:185mm Material:Iron and aluminum alloy Smooth cam action lever Extruded CNC machined alloy nut Quality quick release anodised alloy seat clamp skewer