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 7-Piece Round Shank Black Oxide Drill Bit Set. This assortment of drilling bits are perfect for materials including wood, metal, and plastic surfaces. This is a perfect compact solution for your around the home projects. 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 3/16" for all your DIY needs. This set includes (1) 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, (1) 1/8" Black Oxide Drill Bit, (1) 5/32" Black Oxide Drill Bit, (1) 3/16" Black Oxide Drill Bit.