IRWIN Assorted Woodboring Drill Bit VT Dimensions and construction where corrosion resistance Sill Pan Flashing and construction where corrosion resistance isn’t required Dual LED light with an independent on off switch illuminate the work area overall length Coarse screw point provides fast boring in hard and soft woods Single spur cutting edge scribes the circumference of the hole for a smoother finish Coarse screw point provides fast drilling in hard and soft woods Full length heat treated bit guards against bending in heavy duty applications Full length heat treated bit guards against bending in heavy duty applications Full length heat treated bit strengthens the twist where the greatest strain occurs All bits have a 4 1 2 In