Description: Material: This extension kit is made of high quality nylon and 316 stainless steel, with high strength and durability, which can bear harsh environment. Use in Sea: The tool can be used in sea water for a long time without being affected by sea water. Purpose: This extension kit is used for yachts, ships, kayaks' repair and modification work. Easy Installation: Easy to install, suitable for most ships and yachts. Size: Length: 203.2mm, Centrum width: 100mm; Adjustable distance: 76.2mm to 228.6mm. Specification: Material: Nylon 316 Stainless Steel Color: White Size Chart: 203.2MM/8.00inch Package Includes: 1 Piece Adjustable Extension Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!