... suit for electrical punch driver,battery punch,hydraulic punch. Round Knockout hole punches set, hole punch tool, for hole presses, ... hole punches are accept.Rectangular hole punches also ok.The knockout punches set, suit for manual wrench, ratchet spanner, hydraulic ... are accept.The hole punches made by CNC Line Cutter machine.Material:40Cr steel.For more details information, business inquiry, ...