Pepetools Center Positioning Die, Set of 13 Clear zinc coating for corrosion protection, turned from high grade steel; these will sustain a lifetime of use Inch sizes: 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 1" Millimeter sizes: 3, 4.75, 6.35, 8, 9.5, 11, 12.7, 14.3, 16, 17, 19, 20.6, 22, 25 Create perfectly concentric washers quickly and easily! Can be used with other brand of disc cutters, although only guaranteed to work with the Pep tools brand