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 Post - 2 x Backrest Screw - 1 x M5 Size Allen Wrench - 1 x Backrest Bolt + Washers - 1 x M6 Size Allen Wrench - 1 x Backrest Post Bellow - 2 x Arm Bracket - 2 x Armrest - 2 x Arm Width Adjustment Knob + Washers . Names