... gas lift/gas cylinder/gas strutUseUsed for boss chair/ office chair/bar chair etc.Quality Kailida Gas Spring have good reputation ... TypeStroke for different kind of chairs.Boss chair: 65mm, 85mmOffice Chair: 100mm, 120mm, 140mm, 160mmBar Chair: 180mm, 200mm, 260mmSampleAll the samples ... 85mmWEIGHT--MATERIAL--20# Steel TubePACKING--10pcs/box FIT FOR--Office Chair ,Machine, Car , Cabinets and so on . BT- ...