1、[High Durability] Bearing steel ensures high durability and will maintain a new luster in few years 2、[Practical] The drilling is accurate, the scale is clear, and the size is clear at a glance. It is very practical 3、[Wide Application Range] Very suitable for opening holes in steel, brass, wood, plastic and other materials 4、[High Strength] Heat resistance and wear resistance, which can be used for a long time 5、[Portable] Small size, can be loaded into the bag, easy to carry, easy to take, easy to use Item Type: Step Drill Bit Model: None Material: Bearing Steel Specification: Metric System: 6-35mm（6-8-10-13-16-19-21-23-26-29-31-33-35mm） 4-22mm（4-6-8-10-12-14-16-18-20-22mm） 6-18mm（6-8-10-12-14-16-18mm） 4-12mm（4-5-6-7-8-9-10-11-12mm） 4-12mm（4-6-8-10-12mm） British 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) 5 x Step Drill Bit 1 x Storage Box