The TURBRO ACS-100 window air conditioner support bracket prevents damage to your window by your heavy window unit while ensuring that your window unit stays safe and secure. Designed for AC units up to 12,000 BTUS in size available from most popular brands such as GE, Frigidaire, Kenmore, and TOSOT. Purchasing Tips: Please check if the AC unit you bought already includes support brackets. You will need to drill 2 holes on the window sill during installation. Please check if your Homeowner Association allows you to drill holes on the window sill to install the brackets. Please know that the brackets might not be so satisfying when working on vinyl, plastic or metal windows though it might technically still work. Contact us if you have any questions.