Office Chair Mechanism with Raise/Lower/Tilt FunctionsPerfect for repairing chairs and stools - Why replace the whole chair if you can repair itFits all standard 1" Gas Lift Pistons. Tilt Tensioner Knob & Height Adjustment LeverMade from hardened steel with quality construction and partsDimensions: Bolt Spacing = 15cm Left To Right 25.5cm Front To Back. *Please check this bolt spacing before purchasingFor Domestic Use Only.