●☀Quick release design that allows you to adjust your bike seat height quickly and easily. ●☀Material: alloy construction; compatible with road bike and mountain bike. ●Smooth cam lever Extruded CNC machined alloy nut ●☀It allows you to adjust the seat height quickly and easily without tools. ●Axle diameter: approx. 6 mm skewer length 56 mm, weight of only 38 g