... Material:HSS4241,4341,9341,M2,M35SIZE:13PC/SET(Metric or Inch),19PC/SET,21PC/SET,25PC/SET,29PC/SETColour:BLACK (Nitriding),Bright,Titanium Coated ... We can offer drill set of different kinds and specifications as your requested.And the product feature is toughness and abrasion resistance ...