Drillco Nitro Series 400N 1/16" - 1/2" X 1/64ths Black/Gold Finish Heavy Duty 29 Piece Jobber Length Drill Bit Set with straight shank is made of high-speed steel that provides long durability when drilling hard materials. Drill bit with spiral flute has a 135 split point that helps to penetrate hard materials without a pilot hole and produces small chips to reduce clogging. It is suitable for most general-purpose applications, offering a combination of hardness and toughness for wear resistance. Spiral fluted tool eliminates chips and reduces clogging. Set includes 1/64" increment in drill bits.