30 Punch Dapping SetSet of 30 Punches wood base provided with set Inches: 7 64" to 2" Millimeters: 2. 8mm to 50. 8mm Our precision made highly polished dapping punches are made from tool steel and hardened to 50 RC on both hit and work ends. Pepetools unique tempering method leaves the shank of the punch at mill hardness, this allows the handle to absorb the shock and prevent crystallization of the metal. Our unique hardening technique enhances the performance and life