A. Powerful Stainless Steel Pulley Block: Each V Type Single Wheel Pulley Block has 4 mounting holes and the diameter of each hole is 7mm, which fits for 3-12 mm width flat belt. It can be mounted on various walls, wood and metal. (Equipped with 4 pcs self-tapping screws and 4 pcs yellow expansion pipes.) B. Superior Groove Wheel: The Single Wheel Lifting Rope Pulley Block is made of stainless steel, which is durable and easy to clean. The thickened steel plate enhances the bearing capacity of the Rope Pulley, which can carry up to 800 pounds. C. Super Mute Duplex Bearing Design: The Silent Duplex Bearing can greatly reduce the friction of the cable pulley and make the cable pulley rotate smoothly and stably. You can hardly hear the sound when it works. D. Wide Application: The Wall Mount Pulley Block is widely used for home fitness, wire rope traction, DIY attachment for home gym pulley system, inverted track, lifting blocks, ladder lift, gym equipment, rolling gate sliding gate and other outdoor works. E. Easy Installation: The pulley is designed for easy installation. You just need to mark the hole location, drill 4 holes with a drill bit in the wall and insert the yellow expansion pipes in the holes, finally, fix the pulley with the self-tapping screws.