29 piece set includes 1/16"-1/2" x 64ths. Convenient plastic case is great for tool protection, storage, and organization. Drill faster and longer than standard jobber drill bits.Black Gold surface treated high speed steel holds lubricant for smoother, longer drilling Drill accurate due to 135 Degree split point Recommended for drilling hard materials, high tensile alloy steels and stainless steels. Made in USA