1. Aftermarket/replacement boat pulley block. Made of stainless steel and nylon material, anti-corrosion and rust-proof, strong and durable. 2. Exceptionally high working loads. Nylon pulleys have a low friction coefficient, high impact resistance, wear resistance, and aging resistance. 3. Low maintenance, long service life. 360-degree rotation prevents rope, cable, or line tangling, easy to use. 4. Equipped with bearings inside for smooth rotation. 5. Spring has strong resilience, secure closure, and holds the rope firmly, strong and reliable. 6. Lightweight, easy to install at high altitude. 7. Suitable for fitness equipment, rigging for yachts, sailing ships, and other applications. Product Name: Universal Single Pulley Maximum load: 600kg (1500lbs) Color: Black + Silver Material: Stainless steel + nylon Package Contents: 2 x Universal Single Pulley Only the above package content; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the real thing. The measurement allowed error is +/- 1-3cm.