Punch and Die Set, Punch Size 1/4 in, Inside Dia. 1/4 in, 1, Punch Material Steel, Number of Punches 1, Punch Type High Force Hydraulic, Round, Construction Case Hardened To 45-50 HRC, Steel, Features Case Hardened to 45 to 50 HRC, Operates from a 10,000 psi Pump Source, Function Hole Making