Product description High-strength & Durable Made of aluminum alloy material, waterproof anti-rust and wear-resisting, durable to use. Adjustable Length ROCKBROS bike kickstand with wrenches to loosen the middle screw, length can be adjustable: 13.4’’-15.7’’ (34-40cm) Suitable for 22‘’-28’’ Bikes Oval tube diameter between 0.59-0.98 inches.(1.5-2.5 cm). Two sizes of Allen wrenches are included in the package, for more convenient installation. Enjoy Cycling, Enjoy ROCKBROS! Installation Steps 1. Put the rubber mat on the oval stay frame. 2. Place the kickstand. 3. Install the screws. For Most Bikes: ROCKBROS bike kickstand fits for 22"-28" mountain bikes, road bikes adult bikes, not for kids bikes or small bikes. Adjustable Length: Loosen the middle screw of the bike kickstand to adjust length between 13.4’’-15.7’’ (34-40cm), oval tube diameter between 0.59-0.98 inches.(1.5-2.5 cm) Aluminum Alloy Material: Made of strong material, waterproof, rust-resistant and wear-resistant, durable to use. Easy To Install: Two hexagon wrenches are included in the package, you can easily install the bike kickstand to your bike. Package Contents: bike kickstand * 1, wrench * 2