1/2 Inch Wolverine 135-Degree Point Jobber Length Hss Drill Bit Tin Coated TipTiN coating is applied to the "working" part of the drill. this allows for all of the benefits that the user receives from a fully TiN coated product, but at a reduced price when compared to a drill that is fully coated. the TiN (Titanium Nitrite) coating provides a super hard surface with high lubricity and longer tool life, as the heat is deflected away from the drill. these drills can be used in a wide range of materials including steel, stanless