The bicycle hooks are made of sturdy and durable stainless galvanized steel and coated with PVC. They are covered with a soft non-slip and non-slip coating that protects the surfaces. Length: 15cm (Screw length: 4cm), the maximum diameter of your bike wheel should not exceed 5cm. Each bike hook can support up to 15kg / 33 pounds, not ideal for heavier bike weights. You'd better use 2 bike hooks to hold an adult bike or some heavy duty product. The vertical bike rack saves space and is very cost effective compared to a traditional bike rack. Easy to install. These hooks allow you to lift your bike, leisure equipment, patio furniture and garden hoses and free up space for your garage. About the product: Suitable for ceilings and wooden walls. Also suitable for cement walls with expansion screws. Hang up your bike for simple repairs and cleaning. The maximum diameter of the wheel of your bicycle should not exceed 5 cm. This item is made with premium material for long lasting use. Specifications: Material: galvanized stainless steel and PVC coated Length: 15cm / 5.9 inch (Screw length: 4cm / 1.57 inch) color: black Item weight: 50g each Package contents: 6 x Bicycle Hooks 6 x Plastic Bolts Note: Stay away from children