Brass Dapping Block For Metalsmiths, Metal Working & Jewelers This is a new brass dapping block Great for metalsmiths, metal working and jewelers Has 25 spheres that measure approximately 2.13, 2.15, 2.16, 2.19, 2.21, 2.23, 2.26, 2.32, 3.53, 3.55, 3.73, 3.78, 4.39, 4.42, 5.41, 5.43, 6.27, 7.94, 8.32, 8.95, 10.91, 12.42, 15.81, 18.82 and 22.45 mm (0.083", 0.084", 0.085", 0.086", 0.087", 0.0877", 0.088", 0.091", 0.138", 0.139", 0.146", 0.148", 0.172", 0.174", 0.212", 0.213", 0.246", 0.312", 0.327", 0.352", 0.429", 0.488", 0.622", 0.74" and 0.883" It measures approximately 3" x 3/4" (76.2 x 19 mm) in diameter Newer versions of the item shown may be shipped, as a result, there may be a slight variation in color and design.