Mysit Heavy Duty 300 Lbs Office Chair Tilt Mechanism, Not Standard Dimension Product Details NOT STANDARD SIZE - 8.6" length x 9" width screw mounting holes center distance with 1.1" ( 28mm )hole diameter. - This tilt mechanism is smaller shorter than the standard butterfly mechanisms. Please measure your screw mounting holes dimensions before ordering. HEAVY DUTY 300LBs - Replacement office chair swivel tilt control seat mechanism rated up to 300LBs. TILT CONTROL - Push lever in to lock tilt, pull out to unlock. FUNCTION - Single lever for seat height adjustment, standard 1.1" or 28mm socket inner diameter fit tapered gas lift cylinders. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.