... 4.up and down adjustable office chair mechanism/multi-functions mechanism adjustable mechanism/ chair adjustable mechanism/ office chair mechanism ... lift mechanism/ lift up mechanism/ gas lift mechanismNB010 functions:1,accept gas lift2,seat height adjustment3,locking(in 5 ... wheel, chair base, mechanical, plastic,seat cushion, armrest, back of a chair, and high class mesh.All products have passed the ...