Bor Yueh Rear Seat Post Mount Bicycle Rear Rack 18" long support arm Deck 13" L x 5" wide Sturdy welded, powder-coated aluminium tubing. Integrated top deck provides protection from road spray. Fits seatposts from 25mm to 32mm (1 to 1¼in) Easy quick seatpost connector so no tools needed Can also be used with side panniers above Was $66 retail Excellent condition $50 Firm **********************