SE JT3403DS Dapping Block Square with Polished High Carbon Steel Cavities, 2" x 2" x 2" Cavity sizes: 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 16mm, 18mm, 20mm, 25mm, 30mm, 35mm, 40mm Polished high carbon steel material Size: 2" x 2" x 2" Brass dapping block cube shaped for metal forming Great for hobbyists, jewelers, and more