Polished One Piece Die-Cast Aluminum Chair Base - Heavy Duty 5-Star Design

Butterfly Mid-Back Seat Base

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Three-Lock Tilt Control Office Chair Mechanism with Lever and Mounting Plate

Butterfly Mid-Back Seat Base

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Aluminum Alloy Office Chair Seat Tilt Mechanism with Lift Control Lever and Mounting Plate

Butterfly Mid-Back Seat Base

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Ergonomic Office Chair Tilt Mechanism | Heavy-Duty Lockable Tilt & Lift Base Plate

Butterfly Mid-Back Seat Base

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Single-lever Tilt Chair Mechanism with Tension Knob – Electroplated Explosion-proof Steel Seat Base for Office & Computer Chairs

Butterfly Mid-Back Seat Base

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Dual-control Linkage Chair Mechanism – Electroplated Explosion-proof Thickened Steel Seat Base for Office and Computer Chairs

Butterfly Mid-Back Seat Base

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