9/16" diameter 302 stainless steel spring.Approximately 10" from pivot point to pivot point. This stainless-steel hatch holder is great for holding boat hatches and many other applications up to approximately 45 lbs. including: Boat lid supports Boat table supports Marine dock and deck box lid supports Truck/RV lids and hatches Many other lids and hatches up to 45 lbs Easy to install and easy to use! Hatch holder automatically pops into place after unlatching- just push or pull to collapse and close. 🔩 Installation screws are not included. Please refer to Instruction Manual below. Medium Hatch Holder Specifications Medium Size-10 in. L x 9/16 in. diam. Supports up to approximately 45 lbs. 302 stainless steel spring Retaining cable to prevent over-extending (optional) Manufactured and assembled in the USA 📕 View Instruction Manual💡 Explore More Ways to Use