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 diameterWe work hard to update our descriptions and pictures of our merchandise. As part of a process of ongoing innovation by our suppliers, newer versions of the item shown may be shipped before we are able to complete an update. As a result there may be a slight variation in color and design.