24 Punch Dapping Set24 full half spheres on Wooden Base. All punches are polished and hardened to 50 Rockwell hardness at both ends, the sphere end and the hit end of the punch. The center of the stem is softer to be able to absorb the shock of the hit. This punch set is presented in an attractive wood base with all sizes clearly marked for easy storage. Diameter Range: Millimeters: 2. 8 mm to 25. 4 mm Inches: 7 64" to 1". Sold individually or as a set.