1. Air Supply:0.6MPa,1L/min 2.Joint Pipe Bore:D12mm 3.Paper Tube Specifications:Inner diameter d=1",d=1/2", 4.Punch Size 4*6 Name Pneumatic Paper Tube Drilling Machine 0.6MPa,1L/min,Joint Pipe Bore:D12mm 1000/day Inner diameter d=1",d=1/2",Punch Size 4*6.35