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 + Washer - 2 x Arm Bracket - 1 x M5 Size Allen Wrench - 1 x Backrest Post - 3 x Mechanism Bracket Screw (8 x 20 mm) + Washer - 1 x Backrest Screw (8 x 10 mm) . Names