The Killer Tools Bumper Perfect Hole Punch, No. ART251, is designed to a punch a perfectly round hole through plastic bumpers for parking sensors. The latest vehicle models have a sensor set in a perfectly round hole with no flange to hide drilling errors. When technicians use aftermarket bumpers they need holes. The traditional method of drilling does not accommodate for unusual sizes, like the 18.2mm parking sensor holes on a BMW. With 10 different hole sizes, the Bumper Perfect kit will allow users to punch a hole in less than 10 seconds, even on painting bumpers, without marring finish, the company says. The Bumper Perfect Hole Punch is designed for U.S. and European model cars.