... lockable gas spring is our best seller 2,When it lock,it will rigid. 3,120,000 times quality gurantee. 1, ... ,We are looking forward to cooperate with you, we will provide best service to you.if you want ,pls ... provide fatigue test report. Our products can open and close 100,000 times, Not leak oil; Our paint is ... 4,When the gas spring is up and down, it's soomth opration without noise. 5,Safe and easy ...