Features: 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_x005F_x000D_ Material: 304 Stainless Steel_x005F_x000D_ Spring Size: 11.0mm (7/16in) diameter and 210.0mm (8-1/4in) length._x005F_x000D_ Reasonable structure, suitable for various hatches of yacht and boats._x005F_x000D_ Not recommended for applications where the hatch will be windy and the spring will be overextended while the boat is underway_x005F_x000D_ 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.