This Kupo bike fixture is made of metal and has an angle-adjustable locking system that can hold the bike in three different positions. The hooks are adjustable to fit all bike sizes and frame styles. The cradles where the bike rests are coated with soft plastic to prevent scratches and other damage to the bike’s frame. To use this fixture, it needs to be mounted on a pole using the included Donut (KD-900) to keep the bike off the ground.