YG-1 Extra Length Dream Drill, Series: DH421, 5/16 in Drill - Fraction, 0.3125 in Drill - Decimal Inch, 114 mm Overall Length, 8XD Cutting Depth, Spiral Flute, 76 mm Flute Length, 8 mm Shank, Straight Shank, 140 deg Point, Split Point, Right Hand Cutting Direction, Micrograin Carbide Cutting Edge, Micrograin Carbide, TiAlN, Applicable Materials: Abrasive Plastic, Chilled Cast Iron, Cast Iron, Cast Steel, Malleable Cast Iron, Non-Ferrous Heavy Metal, Non-Ferrous Light Metal and Steel, Specifications Met: DIN 6537, Yes Through Coolant