... conventional punch & dies No guess work needed to center the I.D. No need to scribe center lines Exclusive, patented punch, pilot ... , 4mm, 5mm, 6mm, 7mm, 8mm, 10mm, 12mm, 16mm & 20mm Nine I.D. sizes: 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm, 12mm, 16mm ...