Spyder Stinger 14 Piece Assorted Woodboring Spade Drill Bit Set Hercules Battery System Transitional Shape Round Material Glass it is listed for Transitional Shape Round Material Glass Included No Additional Items Included Returnable 180 Day Color Finish Iridescent Features Approved For Commercial Use Each 6 in x 36 in plank features an embossed texture Series Name Stinger Sub Brand Stinger Bit Type Spade bit Bit Length 6 1 2 in Shank Size 1 4 in Shank Type Hex Material Black oxide coated HSS Case Type Soft Quick Change Yes For Use With Power tool For Use on Metal No For Use on Wood Yes Warranty 30 day Set Individual Set Package Quantity 14 CA Residents: Prop 65 Warning(s) Yes Brand Model Compatibility Universal Bit Diameter (Inches) Assorted 20x faster than conventional spade bits 10x more holes than conventional spade bits Spyder stinger(TM) automatically engages the work surface for no thrust drilling Unlike other spade bits with a self feeding thread point