Chicago-Latrobe Heavy Duty Jobber Length Drill Bit, Series: 150ASP, Imperial, Drill C - Letter, 0.242 in. Drill - Decimal Inch, 4 in. Overall Length, 5XD Depth of Cut, 2 Flutes, Right Hand Spiral Flute, 2-3/4 in. Dia. x 1.25 in. Long Flute Length, Straight Shank, 1 in. 35 Degree Point, Split Point, Right Hand Cutting Direction, HSS Cutting Edge, No Step Coolant, HSS, Black Oxide, Applicable Materials: Alloy Steel, Cast Iron, Stainless Steel and Tool Steel