Steel Dapping Block This is a new steel dapping block The depressions have a smooth finish that are great for shaping metal Made from high carbon tool steel with a Rockwell hardness of 45 Hrc The half spheres and half cylinders are precision machined and hardened to perfection Has 4 half spheres on one side and 11 on the other side that measure approximately 1.78, 3.78, 4.10, 6.92, 7.61, 10.31, 12.50, 14.60, 15.58, 16.46 and 18.73 mm (0.07", 0.15", 0.16", 0.27", 0.3", 0.4", 0.49", 0.57", 0.61", 0.65" and 0.74") Has 6 half cylinders that measure approximately 6.35, 7.62, 9.39, 12.44, 16.25 and 19.05 mm (0.25", 0.3", 0.37", 0.49", 0.64" and 0.75") Has two 90° angles that measure approximately 3.55 and 4.57 mm (0.14" and 0.018") The block measures approximately 2 1/2" x 2" x 1" (63.5 x 51 x 25 mm) Newer versions of the item shown may be shipped, as a result, there may be a slight variation in color and design.