Features: brand new and high quality ●This is the best grade of High Speed Steel Real engineering quality ●The drill bit group is fully precise and heat-treated to improve strength and durability. ●A fully milled drill is machined from a single bar, which is much better than a laminated drill or a conventional twist drill. Their manufacturing costs are also much higher. ●They have long-lasting machinability and use an aggressive 135-degree split point design. ●The suit also comes with a convenient custom L-shaped carrying for case, so you can organize them in the correct and tidy position. ●Starting from 1 mm, the size of these holes increases in 0.1 mm increments, silver, high speed ground steel ●Generally used for wood, metal and plastic, the size is from 1 mm to 6 mm in increments of 0.1 mm ●Scope of application: processing of stainless steel, die steel, steel parts, iron, copper, aluminum profiles, wood, plastics and other pro-ducts. Specifications: Material: High Speed Steel Color ： Silver Size: Approx.1~6mm/0.039-0.23inch Package Includes: 1 Set Drill Bit note: 1.Please allow 1-2mm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.