This polished stainless steel dapping block features 18 half-sphere depressions ranging from 1/8" to 1 - 9/16" (4 to 40 mm) in diameter. Whether you're a novice or veteran jeweler, this tool will be invaluable when shaping metal to a variety of dome sizes. Block can be used with metal dapping punches or a ball pein hammer. The block's dimensions are 48x48x48mm. In order to prevent rust, the dapping block is lightly coated with oil. Simply wipe down with a dry paper towel or rag before using.