3/4 x 6-In. Silver & Deming High-Speed Black Oxdie Drill Bit
"MIBRO GROUP" BLACK OXIDE DRILL BIT Master Mechanic, 3/4" x 6" 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.