Steel Dapping Block Great For Metalsmiths, Metal Working & Shaping Soft Metals & Waxes. 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 9 half spheres on one side and 5 on the other side that measure approximately 3.2, 4.8, 6.4, 7.9, 9.5, 11.1, 12.7, 14.3, 15.9, 17.5, 19.1, 20.6, 22.2 and 25.4 mm (0.12", 0.18", 0.25", 0.31", 0.37", 0.44", 0.5", 0.56", 0.63", 0.69", 0.75", 0.81", 0.87" and 1"). Has 8 half cylinders that measure approximately 6.4, 7.9, 9.5, 12.7, 15.9, 19.1, 22.2 and 25.4 mm (0.25", 0.31", 0.37", 0.5", 0.63", 0.75", 0.87" and 1"). The block measures approximately 3 3/4" x 2 1/2" x 7/8" (95.2 x 63.5 x 22 mm).