Chicago-Latrobe - Workman's Length Drill, Heavy Duty, Series: 550, Imperial, H - Letter Drill, 0.266 in. Drill - Decimal Inch, 4-1/8 in. Overall Length, 5X Depth of Cut, 2 Flutes, Right Hand Spiral Flute, 0.266 in. Diameter x 1.25 in. Flute Length, L Shank, Straight Shank, 135 Point Tip, Split Point, Right Hand Cutting Direction, M42 HSS-Co 8% Cutting Edge, No Coolant Pass, M42 HSS-Co 8%, Straw Oxide, Applicable Materials: Alloy Steel, Stainless Steel, Titanium and Tool Steel