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.