DEWALT 8 Piece Assorted Woodboring Self feed Drill Bit Set Metal Cutting Blades A: It uses 4 1 2 in 314846561 A: It uses 4 1 2 in Space Between Bulbs (in Aggressive spur provides fast material penetration Optimized cutting geometry provides longer bit life Open tooth design allows for more resharpenings 7 16 In ball groove shank for quick change applications Applications include drilling rough holes in wood for running pipe Series Name N A Sub Brand N A Bit Type Self feed bit Bit Length Assorted Shank Size 7 16 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 8 CA Residents: Prop 65 Warning(s) Yes Brand Model Compatibility All Bit Diameter (Inches) Assorted