IRWIN 4 in 6PC Drill Bit Set Miter Saws 30 Watt fan will effectively ventilate 30 Watt fan will effectively ventilate up to 2500 sq Chuck Type Keyless Product Width (in The Fastest Speedbor ever Tri Flute design for faster chip ejection Cutting spurs have 3 cutting edges for added durability Full screw tip allows bit to self feed Grooved hex shank prevents slipping in drill chuck or bit extension Fits all standard 1 4 in quick change chucks IRWIN Pro Set Case is made of durable molded ABS resin Series Name N A Sub Brand SPEEDBOR Bit Type Self feed bit Bit Length 4 in Shank Size 1 4 in Shank Type Hex Material High speed steel Case Type Hard Quick Change Yes For Use With Power tool For Use on Metal No For Use on Wood Yes Warranty None Set Individual Set Package Quantity 6 Brand Model Compatibility Universal CA Residents: Prop 65 Warning(s) Yes Bit Diameter (Inches) Assorted