[Powerful Stainless Steel Pulley Block] Each V Type Single Wheel Pulley Block has 4 mounting holes with a hole diameter of 7mm, compatible with 3-12 mm width flat belts. It can be mounted on various surfaces including wood and metal. Includes 4 self-tapping screws and 4 yellow expansion pipes for secure installation. [Superior Groove Wheel] The Single Wheel Lifting Rope Pulley Block is constructed from high-quality stainless steel, offering durability and easy maintenance. The reinforced steel plate increases load capacity, supporting up to 800 pounds. [Super Mute Duplex Bearing Design] Equipped with silent duplex bearings that significantly reduce friction, ensuring smooth and stable rotation with minimal noise during operation. [Wide Application] Suitable for a variety of applications such as home fitness systems, wire rope traction, DIY attachments for home gyms, inverted tracks, lifting mechanisms, ladder lifts, gym equipment, rolling gates, sliding gates, and other outdoor uses. [Easy Installation] Designed for straightforward mounting. Mark the desired location, drill 4 holes using a suitable drill bit, insert the included expansion pipes, and secure the pulley in place with the provided self-tapping screws.