Master Mechanic, 1" x 6", Silver & Deming, High Speed Steel, Black Oxide Drill Bit, Jobber Length, 1/2" Reduced Shank, 3-1/8" Flute Length, Black Oxide Surface Finish Improves Chip Flow & Increases Abrasion Resistance, Recommended For Drilling Wood, Plastic & Soft Metals, Used In Machine Shops Using Screw Machines Or Where The Maximum Chuck Capacity Is 1/2", Carded.