Jeweler's Steel Dapping Doming Block 14 Half-Spheres 8 Half-Cylinder Jeweler's tool for creating domed, rounded, spherical designs for necklaces, earrings, decor pieces 4 x 2-1/2" zinc steel alloy block with 14 milled half-spheres & 8 half-cylinders; weighs 34 ounces One tool covers half-sphere sizes 2.5mm to 25mm, half-cylinders 3mm to 25mm Professional results forming gold, silver, copper, bronze workpieces Use with wood, metal or nylon dapping punches (not included - available separately)