Hollow Punch Tool MAYHEW 12mm Hollow Punch | Sales Ltd Mayhew 50516 Hollow Punch Used to create precise gaskets and washers in softer materials; e., g. Mayhew Tools 50501 Hollow Punch 1/8 Inch Round Steel cloth, vinyl, leather, light sheet metal and gasket material 1/2 in_3/4 in_1 in_4 3/4 in Overall Lg, 16 Pieces, Metric Hollow Punch... ) 1-1/2, Round Design, Black Oxide Alloy Steel Construction, Characteristics Dual Cutting Heads, Application Used To Make Gaskets, Washers, And Sealing Rings In Different Materials 1/2 in_3/4 in_1 in_4 3/4 in Overall Lg, 16 Pieces, Metric Hollow Punch Dual cutting heads allow the user to punch concentric circles in one strike