Festool 769240 Rubber Battery Bumper provides your Festool Lithium Ion flat pack batteries with extra protection against the bumps and knocks of everyday use, while also adding stability. Designed to fit both 15V and 18V batteries, this bumper helps extend the life of your batteries by shielding them from damage. Please note that the battery is sold separately. This product is not compatible with 10.8V (CXS Drill) batteries or the newer 18V Airstream version batteries, as Airstream batteries already come with a built-in bumper. Model Number: 769240