Feature:1. [High Durability] Bearing steel ensures high durability and will maintain a new luster in few years2. [Practical] The drilling is accurate, the scale is clear, and the size is clear at a glance. It is very practical3. [Wide Application Range] Very suitable for opening holes in steel, brass, wood, plastic and other materials4. [High Strength] Heat resistance and wear resistance, which can be used for a long time5. [Portable] Small size, can be loaded into the bag, easy to carry, easy to take, easy to useSpecification:Item Type: Step Drill BitModel: NoneMaterial: Bearing SteelSpecification:Metric System:6-35mm6-8-10-13-16-19-21-23-26-29-31-33-35mm4-22mm4-6-8-10-12-14-16-18-20-22mm6-18mm6-8-10-12-14-16-18mm4-12mm4-5-6-7-8-9-10-11-12mm4-12mm4-6-8-10-12mmBritish System:3/16in to 1/2in (3/16in, 1/4in, 5/16in, 3/8in, 7/16in, 1/2in)1/8in to 1/2in 1/8in,5/32in,3/16in,7/32in,1/4in,9/32in,5/16in,11 /32in, 3/8in, 13/32in, 7/16in, 15/32in, 1/2in)1/4in to 3/4in 1/4in,5/16in,3/8in,7/16in,1/2in,9/16in,5/8in,11 /16in, 3/4in)1/4in to 1-3/8in (1/4in, 3/8in, 1/2in, 5/8in, 3/4in, 7/8in, 1in, 1 -1/8in,1-1/4in,1-3/8in)3/16in to 7/8in (3/16in,1/4in, 5/16in, 3/8in, 7/16in, 1/2in, 9/16in, 5/8in, 11/ 16in,3/4in,13/16in,7/8in).Package List:5 x Step Drill Bit1 x Storage BoxNote:Please allow 0 to 2 cm error due to manual measurement. Thanks for your understanding.