HSS fully ground twist drill bit with titanium coated

  surface finishing:bright, black oxide, tin coated, black flute&white shank or rainbow

*Size range from Diameter 1mm to 20mm.

*118° split point or 135° Split point

*hot fully ground flute with special heat treatment gives advanced throughness durability of the drill bit

*black oxide finish for greater resistance to wear

*economic hign speed steel bit for general drilling

*for drilling in steel,cast steel,malleable iron,sintered metal,non-ferrous metal

 *Package can be plastic tube,paper bag,blister card,plastic bag etc.