Screw punch for uniform, deformation-free punching of sheets such as steel, V2A, copper, and aluminum with a diameter of 17 mm. 3-point cutting edge: Optimal support ensures a clean cutting process. Metric tension screw, highest quality class 12.9 (from Ø 15.2 mm): Extremely durable. Special tool steel, blackened: For a long service life. Small working diameter: Ideal for hard-to-reach areas such as in control cabinets, junction boxes, control panels, sink basins, and vehicle bodies. With the screw punch, heating and plumbing installers can create uniform holes with a diameter of 17 mm for various applications.