Sunex International Air Punch/Flange Tool Set with Interchangeable Heads SUNSX281 Sunex International Air Punch/Flange Tool Set with Interchangeable Heads SUNSX281 Meets ICAR standard Both 3/16" (5mm) and 5/16"(8mm) punch/flange heads included in one set Punches steel or aluminum sheeting up to 2.0 thickness Patented punch/flange heads can be changed quickly and easily Comfort grip sleeve for better control Convenient blow mold case for tool protection and storage