Made of high quality stainless steel,super wear-resisting,strong and durable. Fit for 3mm-10mm wire rope,climbing rope or twine. Mute pulley,no noise,smooth and effortless.It can be mounted on wood,walls and metal. Each pulley is fitted with 4 self-tapping screws and 4 yellow expansion sleeves . Suitable for home fitness and outdoor work.Can be used for shoulder arm exercise fitness equipment. Type: U Type Single Wheel Pulley Block Overall Height: 60mm Overall Base Size: 68x30mm U-Type Groove Depth: 6mm U-Type Groove :inner width:16mm,outer width:22mm Wheel Diameter: 48mm Attention: The own loadbearing of the pulley is 800 pounds. But there will be a big difference depending on the material and angle used. Used on the wood at vertical angle, the loadbearing is about 200 pounds. It can withstand 800 pounds at a 45 degree angle on a concrete wall. colour:silver Material:stell Package included: 4 x U-Type Single Wheel Pulley Block Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.