1、Made of high quality aluminum alloy material, durable, hard, pressure resistant, safe and stable. 2、Quick release design, convenient and quick disassembly and assembly, it is safe, stable and easy to carry during transportation. 3、Wide range of uses, suitable for storage or transportation, compatible with the widest range of vehicles. 4、4 kinds of size options can be suitable for more types of bicycle conversion ring size., 5‑W100 is suitable for quick release rod diameter: 5mm/0.19in, front fork outer diameter: 100mm/3.93in. 5、12‑W100 is suitable for quick release rod diameter: 12mm/0.47in, front fork outer diameter: 100mm/3.93in, 15‑W100 is suitable for quick release rod diameter: 15mm/0.59in, front fork outer diameter: 100mm/3.93in. 6、5‑W110 is suitable for quick release rod diameter: 15mm /0.59in, front fork outer diameter: 110mm/4.33in, suitable for quick release: 5x100mm/0.19x3.93in, 12x100mm/0.47x3.93in, 15x100mm /0.59x3.93in, 15x110mm/0.59x4.33in Item Type: Quick Release Fork Mount Bike Block Material: Aluminum Alloy Product Size: Length 110mm/4.33in x Width 37mm/1.45in x Height 56mm/2.2in (Manual Measurement Allows 1-2cm/0.3-0.7in Error) Hole to Hole Distance: Approx. 38mm/1.49in Compatible Quick Release: 5x100mm/0.19x3.93in, 12x100mm/0.47x3.93in, 15x100mm /0.59x3.93in, 15x110mm/0.59x4.33in 8 x Side Cover Quick Release Barrel Shaft 1 x Bracket