Bosch 21 Piece Assorted Black Oxide Coated HSS Twist Drill Bit Set Tongue and Groove 75 GPM max flow balances Color:Black (Textured Finish) 75 GPM max flow balances pressure and efficiency monolithic weather and waterproofing seal that will adhere tightly to a wide variety of roofing substrates and will provide significant energy savings due to its excellent sun reflectance and larger Universal drilling applications – designed for general purpose use High visibility marking – provide clearly marked diameter Brand Model Compatibility Fits most drill dirvers Type Jobber length Bit Length Set Shank Size Set Shank Type Flat Right Left Hand Right handed Tip Geometry 135 degree split point Heavy Duty No Material Black oxide coated HSS Package Quantity 21 For Use on Fiberglass Yes For Use on Metal Yes For Use on PVC Yes For Use on Stainless Steel No For Use on Wood Yes Set Individual Set CA Residents: Prop 65 Warning(s) No Warranty None Bit Diameter (Inches) Assorted Maximum Drilling Depth 3 in