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Features:
1. 5pcs step drill bits enable 50 sizes - each step drill bit can drill several bore diameters. It's can work as 50pcs twist drill bits. You don't have to replace drill bit constantly for different bore sizes.
2. classic and sturdy high-speed steel with titanium coating for proven capability and durability in drilling holes in plastic, aluminum, copper, stainless steel and many other types of the metal sheet.
3. cutting blades and X-type openings design ensure a faster and smoother cutting; 3-sided shank design prevents slip in drill chuck can cut through the wood, sheet metal, steel, and other surfaces.
4. The step drill bits can be used to chamfer, bur, and drill or enlarge holes. The step drill bits can work with stainless steel sheets, aluminum alloy, plastic material, and wood. The protective aluminum case makes the drills not easy to dull, canvas packing will more light and easy to carry, both of them would be shipped randomly.

Specification:
Our step drill bits are constructed from traditional HSS combined with a titanium coating to make them even more durable.
This also proves the capability and durability of the drill to last through multiple drilling on surfaces such as: plastic, aluminum, copper, stainless steel, and so much more.
Increased Cutting Speed
The split point tip is at 135 degrees which allows you to cut faster throughout multiple uses.
This also ensures that you get sharp cutting on a wide variety of materials.

Advantages of HSS Step Drill Bits
1. Drills holes of various sizes without changing bits.
2. Prevents metal scurf from flying around for improved safety.
3. Smooth hole edges, perfect to drill holes for HVAC jobs.
Smoother and rounder holes.
4. Minimal shocks and almost impossible to snap compared to conventional bits.
5. Double cutting blades design enables a faster and smoother cutting;
6. X-type openings design to facilitate the removal of cutting waste when drilling;
7. 3-sided shank prevents slip in drill chuck;
8. Cobalt added reduces friction and lasts longer than those which does not contain cobalt bits