Tungsten carbide drill bits :
Size: Dia 1mm -20mm
Tolerance :H5 H6
Special designed chip groove excellent chip removal properties
Coating /un-coating
Functional :
Gray iron ,ductile cast iron ,stainless steel ,strucutral steel ,alloy steel and other common materials ,precise centering ability which enables to gain stable dimensional accuracy and fine surface ,suitable for process system with excellent rigidity .
