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.