... 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 ... IS09001: 2000 quality system authentication. chair specification: Size of back: 52x75CMSize of seat: 51x52CMHigh of Seat: 45~53CMSize of ...