Usage Tips:1. Replacement Boat Pulley Block.Made of 304 stainless steel and nylon material, anti-corrosion and rust-proof, strong and durable. 2. Exceptionally high working loads.Nylon pulleys have low friction coefficient, high impact resistance, corrosion resistance, and aging resistance. 3. Low maintenance, long service life.360 degree rotation prevents rope/cable/line knots, easy to use. 4. Equipped with bearings inside, smooth rotation. 5. The spring has strong resilience, close bite, strong and durable. Product Name: Universal Head Single Pulley Light weight, easy to install at high altitude. Suitable for fitness equipment, rigging for yachts, sailing ships, etc. Colour:Black Material:Nylon + 304 stainless steel Package Contents: 1x Universal Head 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.