Die Button Shims quickly adjust the height of sharpened die buttons. Made from a 302 full hard stainless steel. Fits six different die button sizes from 6mm to 20mm. Easily extends the “life” of a die button and saves time over hand punching custom shims. Large I.D. accommodates multiple size die openings and reduces the risk of “slug stacking”. Precision Brand® 330 Piece Metric Die Button contains 10 each of the following sizes in six thicknesses (0.125mm, 0.25mm, 0.40mm, 0.50mm, 0.65mm, and 0.80mm): 6mm I.D. x 8mm O.D.; 8mm I.D. x 10mm O.D.; 8mm I.D. x 13mm O.D.; 12mm I.D. x 16mm O.D.; and 16mm I.D. x 20mm O.D. And 5mm x 6mm in 0.125mm, 0.25mm, and 0.40mm.