... —MAXDRILL Tap hole Drill Bit (1)Diameter:38mm-70mm.(2) shape, carbide 3-blade type , steel cross bit , carbide cross bit ,button bit andetc(3)Package: in ... drill rods and tap hole drill bits are available. (1)Diameter: 38mm-70mm.(2) Shape; carbide 3-blade type, steel cross bit, carbide cross bit, button bit ...