General purpose flute design. All sizes have a 1/2" by 2-1/4" long shank. The maximum overall length is 6" and the flute length is 3". This makes them short drills in the larger sizes and thus well suited to use in portable electric drills equipped with 1/2" chucks. They are highly effective in tough, high tensile strength materials. The 135 deg split point reduces thrust and eliminates walking at the drill point.

Drillco Silver and Deming Drill, Imperial, Series: 1000EF, 5/8 in Drill - Fraction, 0.625 in Drill - Decimal Inch, 6 in Overall Length, 3 in Cutting Depth, Spiral Flute, 3 in Flute Length, 1/2 in Shank, Reduced with 3-Flat Shank, 135 deg Point, Split/Self-Centering Point, Right Hand Cutting Direction, HSS Cutting Edge, HSS, Bright/Black, Applicable Materials: Tough and High Tensile Strength Materials