1, [Stainless Steel] Made of high-quality 316 stainless steel, can be used in seawater or harsh environments. 2, [High Strength] High-strength nylon wheels are more wear-resistant and have a long service life. 3, [Safer to Use] The shell and nylon wheel are fixed by riveting technology, which makes them not easy to slip off, sturdy and durable, and safer to use. 4, [Surface Treatment] The outer surface of the product is electroplated, which provides strong corrosion resistance and a beautiful appearance. 5, [Scope of Use] These stainless steel lifting blocks can be used for small lifting in boating and kayaking. Item Type: Lifting Block Material: Stainless Steel Specification: Approx. 25mm 1 inch 1. Stainless steel precision casting parts, rustproof, corrosion resistant and durable 2. Purpose: Small lifts for sailing, kayaking 2 x Lifting BlocksSatisfaction Guarantee: Customers are our top priority. If you find any problem with the product, please contact the seller immediately. We strive to provide satisfactory customer service.