Black Oxide Drill Bits Provide 3X Longer Life and Faster Drilling 135° Split Point Drills on Contact For Metal, Wood, and Plastic Surfaces RYOBI introduces the 15-Piece Round Shank Black Oxide Drill Bit Set. This assortment of drilling bits are perfect for materials including wood, metal, and plastic surfaces. The bits are constructed out of high speed steel with a black oxide finish to offer superior durability and 3X longer life. Another feature of these bits is the 135° split point to drill on contact and prevent your bit from walking. The clear case cover provides visibility for better ease of access. This assortment includes bits ranging from 1/16" to 3/8" for all your DIY needs. This set includes (2) 1/16" Black Oxide Drill Bit, (1) 5/64" Black Oxide Drill Bit, (1) 3/32" Black Oxide Drill Bit, (1) 7/64" Black Oxide Drill Bit, (2) 1/8" Black Oxide Drill Bit, (1) 9/64" Black Oxide Drill Bit, (1) 5/32" Black Oxide Drill Bit, (1) 3/16" Black Oxide Drill Bit, (1) 7/32" Black Oxide Drill Bit, (2) 1/4" Black Oxide Drill Bit, (1) 5/16" Black Oxide Drill Bit, (1) 3/8" Black Oxide Drill Bit.