The 7-piece tool set enables a precise punching of holes into the bumper for parking sensor when retrofitting the parking distance control. The punches can be used with a ratchet or a simple cordless drill (13 mm wrench size). When punching the holes into the bumper there is no damage to the paint, thus repainting becomes unnecessary. The kit contains 6 different diameter sizes of punches: 17, 18, 19, 20, 21 and 22 mm (more sizes upon request). The diameter is marked on the outside of the punch.