Upgraded Window Air Conditioner Support Bracket, No Drilling Bracket with Adjustable Width up to 18.9in, Heavy-Duty Holds 250lbs, Easy Installation, Fits Most Single or Double-Hung Windows. Non-Slip Rubber Pads: The window air conditioner bracket is equipped with rubber foot pads to increase friction between the bracket and the wall, effectively preventing your AC unit from slipping or falling, while also reducing noise during operation.
eBay