Durable and Precise – Constructed with Carbon Steel (CS) which provides a combination of hardness and toughness for wear resistance, making it ideal for complicated drilling applications requiring precision..Multiple Uses – For a better experience, Gyros Wire Gauge Micro Drill Bits can be utilized with a variety of hand and motorized tools. Straight Shank Mini Bits are compatible with a wide range of tool holding systems. To use with most power rotary tools, use with Gyros Mini Adaptor Chuck 45-01803. For all your hand drilling needs, pair with the Gyros Swivel Head Pin Vise 97-01818.12 Micro Twist Drills – Professional Craftsmen, Model Makers, Hobbyist, Jewelers, and Do-It-Yourself enthusiasts prefer these Gyros Mini Drill Bits, which come complete with 12 (1 Dozen) small-diameter twist drills size #59 (.0410”/1.041MM) providing quality and value for your money and are a Must-Have for all your drilling tasks..Convenient and Easy Storage – These Gyros Mini Drill Bits come in a handy clear vial storage case with a protective tight fit cover to keep drills secure and prevent them from being damaged or lost..Wide Application – All Gyros Wire Gauge Mini Drill Bits are ideal for all projects that demand precise hole drilling. Gold, silver, wood, hard and soft metals, plastic, PVC, beads, and jewelry are all good candidates for Gyros Micro Drills. Some people may even try to use it to clean small carburetors’ emulsion tubes and jets. This Gyros Wire Gauge Mini Drill Bits with Clear Vial Storage is the perfect option for all of your drilling projects.