Check the listing for details. Gas Spring Pneumatic Stay 8 kg (17 lbs). Condition: New. Listed at 14.99 USD. NEW, Gas Spring Pneumatic Stay, 8 kg (17 lbs), 162396, Provides silent, precise and reliable movement, Simple to install, Correctly rate your stay for accurate and easy opening / closing (see formula), Comes with screws, mounting plates, and instructions, Gas Springs provide silent, effortless, precise and reliable movement that is unattainable with stays using metal springs or friction to control motion. The stays, usable on both down-moving and up-moving lids, are simple to install. The mounting brackets are applied to the case and the lid separately and the body of the stay just snaps on. Pneumatic stays are rated by closing force in pounds. You will need to find the correctly rated stay for your project. Too much will not allow the lid to close properly. If your lid is wider than 36",.