Feature: 1. Dimensions: Spring hinge coil length is 8‑1/4in (210.0mm), spring stock diameter is 7/16in (11.0mm), and support lids up to 10 pounds. 2. Professional Design: Equipped with hatch opening spring and fork U bolt support plate. Retaining cable to prevent over opening. Snaps straight to hold lid open and deflects to close. 3. High Strength Material: Boat hatch support spring is made of marine grade 304 stainless steel, rust resistance, can be used in acid, alkali and humid environments. 4. Multi Purpose: Marine hatch support adjuster is widely used, such as RV, camper, yacht, bait well, fore hatch, hatch, door and window. 5. Easy Operation: Exquisite workmanship, simple to install, no complicated tools required, convenient to use, and can be used for a long time. Specification: Item Type: Hatch Support Spring Material: 304 Stainless Steel Spring Size: 11.0mm (7/16in) diameter and 210.0mm (8-1/4in) length. Reasonable structure, suitable for various hatches of yacht and boats. Not recommended for applications where the hatch will be windy and the spring will be overextended while the boat is underway Application: This stainless steel Hatch Support Spring holds open hatches, doors, table leaves and motor boxes cabinet, window, lighter hatches, table leaves, ice box lids, bait well, fore hatch and a wide variety of uses.. Package List: 2 x Hatch Support Spring