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 - 2 x Armrest - 2 x Arm Width Adjustment Knob + Washers - 3 x Mechanism Bracket Screw + Washer(8*20mm) - 2 x Arm Bracket - 1 x M5 Size Allen Wrench - 4 x Backrest Screw (8*25mm) - 1 x Back Bar . Names