Precision Twist Drill Taper Length Drill, High Helix, Series: R51FS, 29/64 in Drill - Fraction, 0.4531 in Drill - Decimal Inch, 7-1/2 in Overall Length, 6XD Cutting Depth, Quick-Spiral Flute, 4-3/4 in Flute Length, 0.4531 in Shank, Straight Shank, 118 deg Point, Conventional Point, Right Hand Cutting Direction, HSS Cutting Edge, HSS, Uncoated, Applicable Materials: Copper, Unalloyed Aluminum, Magnesium, Alloyed Aluminum and Magnesium Alloy