●The climbing roller is made of high-quality aluminium alloy, rust-proof, high strength and durable. ●Durable, can withstand a pulling force of about 26 kN, the side plates can prevent the rope from slipping, super reliable to ensure your safety when climbing. ●Fine polish provides a smooth surface and ensures smooth and fast rotation to greatly reduce friction. ●The small hole is 12mm, the large hole is 14mm, suitable for rope diameter below 12mm. ●Perfect for climbing, also great for other purposes such as towing, transporting etc.