2" Stainless Steel Dapping Block Square with 18 Half Sphere Cavities Block Dimensions: 2" x 2" x 2" 18 half-sphere depressions ranging from 1/8 to 1 - 9/16 (4 to 40 mm) in diameter Cavity Sizes (mm): 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 18, 20, 25, 30, 35 & 40 Made of polished stainless steel In order to prevent rust, the dapping block is lightly coated with oil