... armrest,powder coated nylon base,Y-19 mechanism, back tilt, seat height adjust,high quality, competitive price. Chair description: 1.material ... inside6.mechanism: Y-19 mechanism, seat height adjust, back tilt, back can be fixed not to tilt. We ourself manufacture ... a manufacturer specializing in design, manufacture kinds of mainly office chairs, dining chairs, and so on. And we ourself manufacture the ...