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 Armresh - 2 x Arm Width Adjustment Knob + Washer - 2 x Arm Bracket - 1 x M5 Size Allen Wrench - 1 x Seat Depth Adjustment Knob + Washer - 1 x Backrest Screw - 1 x Backrest Post . Names