Designed for punching burr-free holes in sheet metalWhen you install electrical boxes or switch cabinets and use hydraulic knockout tools to punch through sheet metal, a strong and sharp knockout punch helps you get clean holes you need. We made PRO Punching Die for punching clean and accurate holes with ease.The PRO Punching Die set features a punch with 2 cutting edges that splits the waste material in half and prevents jamming. This means you can make perfect, burr-free holes in steel up to 3 mm thick and stainless steel up to 2.5 mm thick faster. The knockout punch and die in sizes between M16-M40 will help you punch holes up to 40.5 mm in diameter. Use sizes PG9-PG36 to punch holes up to 47 mm in diameter.Features and Benefits:Designed for punching burr-free holes in sheet metalFALSEFor punching holes in steel up to 3 mm thick and stainless steel up to 2.5 mm thick, eg when installing electrical boxes and switch cabinetsHighly efficient for electricians and installers: Robus