Sherwood: 9/16" HSS-Co 5% 2 Flute Threaded Shank Short Series Slot Drill Short Series - Metric. Bright finish. Flute type: 30 helix. Manufactured to BS 122: Part 4: 1980. Inch Tolerances: Diameter: ~ up to 1/2". Tolerance: +0.0005, -0.0013.…View more