... Block Each face with different size of the hemispheres. Jewelry Tool Steel Dapping BlockEach face with different size of the hemispheres ... sized depressions.It features 17 machined half-sphere depressions: 3.2, 4.8, 6.4, 7.9, 11.1, 12.7 ... .3, 15.9, 17.5, 19.1, 20.6, 22.2, 25.4, 28.6, 31.8, and 34.9mm(1 ...