Solid Carbide Drill Bit As Per Din 338, Diameter-4.2. Mm, Flute Length-43 Mm, Over All Length-75 Mm, Drill Dia Tolerance -H7, Coating-Tialin Titanium Nitrate Coated. Make/Brand- Miranda Tools Or Bosch Or Addison Or Hittco Tools Ltd. Or Equivalent. [ Warranty Period: 30 Months After The Date Of Delivery ] ]