DEWALT 21 Piece Assorted Black and Gold Coated HSS Twist Drill Bit Set 12 Door Mailboxes per minute flow rate which Hex Shank per minute flow rate which ensures a steady water flow after years of everyday use paintable grills and frames Brand Model Compatibility Universal Type Jobber length Bit Length Set Shank Size Set Shank Type 3 flat Right Left Hand Right handed Tip Geometry 135 degree split point Heavy Duty No Material Black and gold coated HSS Package Quantity 21 For Use on Fiberglass No For Use on Metal Yes For Use on PVC Yes For Use on Stainless Steel Yes For Use on Wood Yes Set Individual Set CA Residents: Prop 65 Warning(s) Yes Warranty None Bit Diameter (Letter) Assorted Bit Diameter (Inches) Assorted Bit Diameter (mm) Assorted Bit Diameter (Number) Assorted Maximum Drilling Depth Set and metal Tapered web design for extreme durability and resisting breakage Black and gold coating to help prevent rust and wear 3 Flats shank to reduce spin out in the chuck (on sizes larger than 3 16 in) Size markings on the drill bit shank for identifying sizes quickly Connectible accessory storage system to optimize storage space Patented bit bar design allows easy removal of bits and customizable placement Clear lid allows you to easily see contents at glance