DURABLE AND PRECISE – Constructed with Carbon Steel (CS) which provides a combination of hardness and toughness for wear resistance to take on intricate drilling tasks where accuracy is critical.MULTIPLE USES – Gyros Wire Gauge Micro Drill Bits can be used with a wide range of hand and motorized tools for a better experience.These Straight Shank Mini Bits allow use with a wide variety of tool holding systems.Use with Gyros Mini Adaptor Chuck 45-01801 to use with most power rotary tools.Use with Gyros Swivel Head Pin Vise 97-01818 for all your hand drilling needs. 25 MICRO TWIST DRILLS – These Gyros Mini Drill Bits comes complete with25 small diameter twist drills size #66 (.0330”/.838 MM) providing quality and value for your money, and therefore is preferred by Professional Craftsmen, Model Makers, Hobbyists, Jewelers, and Do-It-Yourself enthusiasts, and is a Must Have for all your drilling tasks.CONVENIENT AND EASY STORAGE – – These Gyros Mini Drill Bits come packaged in a convenient clear, numbered vial storage case, with a protective tight fit cover to secure drills and prevent any damaged or lost bits.WIDE APPLICATION – All Gyros Wire Gauge Mini Drill Bits is perfect for all projects that require the drilling of precise holes.Gyros Micro Drills are ideal for gold, silver, wood, hard and soft metals, plastic, PVC, beads, and jewelry.Some people may even try to use it to clean emulsion tubes and jets in small carburetors.This Gyros Wire Gauge Mini Drill Bits with a Clear Vial Storage is definitely the best choice for all your drilling tasks.Size : #66 (.0330”/.838 MM) | Number of Items : 25.