Feature:1. 5 Pcs Set: The set contains 5 pcs step drill bits of different specifications, which are 3/16 to 1/2in, 1/8 to 1/2in, 1/4 to 3/4in, 3/16 to 7/8in, 1/4 to 13/8in.2. HSS Material: Made of excellent high speed steel material, the drill bits are wear resistance, not easy to rust, have long service life.3. 2 Flute Design: The step drill bits are designed in 2 flutes, making the cutting and punching faster and smoother.4. Standard Size: Precisely manufactured, the step drill bits with standard shank size can be connected to the drill machine perfectly.5. Applicable Items: This step drill bit set is suitable for carbon steel, iron plate, aluminum plate, PVC plate, wood plate etc. workpieces with hardness less than 25.Specification:Item Type: Step Drill Bit SetMaterial: High Speed Steel 4241Aluminum Box Size: Approx. 15x11x4.5cm/5.9x4.3x1.8inUse: Suitable for workpieces below 25, such as carbon steel, iron plate, steel plateSpecifications:1. 3/16 to 1/2in (3/16, 1/4, 5/16, 3/8, 7/16, 1/2)2. 1/8 to 1/2in (1/8, 5/32, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8, 13/32, 7/16, 15/32, 1/2)3. 1/4 to 3/4in (1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4)4. 3/16 to 7/8in (3/16, 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8)5. 1/4 to 1-3/8in (1/4, 3/8, 1/2, 5/8, 3/4, 7/8, 1, 1-1/8, 1-1/4, 1-3/8).Package List:1 x 3/16 to 1/2in Step Drill Bit1 x 1/8 to 1/2in Step Drill Bit 1 x1/4 to 3/4in Step Drill Bit1 x3/16 to 7/8in Step Drill Bit1 x1/4 to 1-3/8in Step Drill Bit Note:It is recommended to wash the drill bit with cold water to reduce operating temperature and prevent overheating and damage.