Bosch 21 Piece Assorted Black Oxide Coated HSS Twist Drill Bit Set Tongue and Groove ) 300 Material Steel Number 1000993234 ) 300 Material Steel Number of Heat Settings 2 Heat Returnable 180 Day Power Fuel Type Natural Gas Heat rating (BTU hour) 10000 Color Family Whites Indoor Outdoor Indoor Rotating Product Diameter (in No skate tip – for clean and accurate starts Black oxide coating – generates less friction Three flat shank – promotes better grip on bits 3 16 In 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