Attributes . - 5 x Caster - 1 x Base - 1 x Seat Post - 1 x Seat Post Cover - 1 x Mechanism - 1 x Seat - 1 x Backrest - 1 x Backrest Plate - 1 x Backrest Depth Adjustable Knob + Washers - 2 x Armrest - 2 x Arm Width Adjustable Knob + Washers - 2 x Arm Bracket - 4 x Mechanism Screw . Names