Q-Max 1/2 in 12.7mm Sheet Metal Punch Hole Punch 

A    quick and easy way to cut clean holes in sheet metal up to 16 gauge.
  Special design allows even load during cutting and produces a burr free hole    that needs no extra finishing.
  Heat treated cutting edges with black anti-corrosive surface finish to prevent    rusting.
  Size. 1/2 in

Key Type.MT. 7/32 in. Not    Supplied