Impact-Ready Four Flute Step Drill Bit Set, 1/8-7/8 (3pcs), 1/4 Hex Shank for Metal, Stainless Steel, Aluminum, Wood, Plastic

✅【M35 Cobalt Superhard High Speed Steel】: ISI M35/1.3243/SKH55/M35 steel is a type of high-speed steel containing cobalt, which possesses characteristics of high wear resistance, high pressure resistance, and sintering resistance.

✅【Four Groove Step Drill】: In contrast to the ordinary step drill, which is prone to flexing during the cutting process, the four-groove step drill is more stable in its cutting action. This design results in a service life that is twice that of regular ladder drills, significantly improved drilling accuracy, faster cutting speed when drilling, and a unique effect on stainless steel drilling.

✅【M35 Step Drill Compatibility】: These step drills can quickly and smoothly drill holes of different diameters, suitable for use on materials such as stainless steel, aluminum, wood, and plastic boards (provided the board thickness is less than the height of the step drill).

✅【34 Sizes: Including】: The step drill set includes a range of sizes, from 1/8" to 1/2" (13 sizes), 1/4" to 3/4" (9 sizes), and 3/16" to 7/8" (12 sizes).

✅【M35 Four Spiral Groove】: The step drill's four-cutting-blade design results in faster, smoother cutting and easier separation of sawdust.

✅【M35 High-Speed Steel with Cobalt】: M35 high-speed steel is characterized by its high hardness (HRC67-70), high red hardness (625°C, 4H, HRC63-65), wear resistance, toughness, and bending strength, which are not lower than those of ordinary high-speed steel. The inclusion of cobalt in the M35 high-speed steel results in a quenching hardness of 1200-1240°C.

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