Dormer Combined Drill and Countersink, Center Drill Double End, Series: A221, 1/8 in Drill - Fraction, 0.125 in Drill - Decimal Inch, #4 Point Diameter, 5/16 in Diameter Body, 2-1/8 in Overall Length, 1/8 in Flute Length, 5/16 in Shank, Straight Shank, 118 deg Point, 60 deg Included Angle, Right Hand Cutting Direction, HSS-E Cutting Edge, HSS-E, Bright, Applicable Materials: Alloy Steel, Aluminum, Aluminum Alloy, Brass, Bronze, Carbon Steel, Cast Iron, Cermet, Copper, Copper Alloy, Free Machining Stainless Steel, Hardened Steel, Magnesium and Nickel