Durable HSS Drill Bit ----- High-speed steel makes it last longer than others, titanium coating ensure easily cut through iron sheets, aluminum sheets, copper & plastic & wood board and many other types of sheet metal with ease, and it can automatically deburr holes while drilling to keep the drill bit clean. | Titanium Coating ----- Coated with titanium, this step drill set performs well in heat, corrosion and rust resistance. | Revolutionary Design ----- Tri-flatted shank fits into power tools chuck securely and eliminates slip; two-flute design clears chips faster and allows particles to escape easily. | Includes 10 Step Sizes ----- 1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8". | A Must-Have for Handyman or Professionals ----- Perfect for home repairs and light jobs such as drilling holes in plastic, aluminum, copper, iron and many other types of sheet metal (excluding steel or any other harder metal).

Durable & Sturdy ----- Solid M2 high speed construction for extra durability, close to impossible to snap compared conventional drill bits, the unique 3-sided shank prevents slip in drill chuck and reduces shocks; oiling the bits recommended before every use to maximize the service life. | Jam-Free Performance ----- Dual-flute design and three-sided shank design is optimized for cordless drills in high speed provides greater speed and control while minimizing steel scurf flying around, to lengthen service life, please do not set drilling speed at its maximum to avoid damage to the cutting edge. | One Bit for All ----- The bit comes with 19 sizes so you can drill up to 19 holes with different diameters from 3/16 to 1-3/8 inch(3/16", 9/32", 3/8", 7/16", 17/32", 5/8", 11/16", 25/32", 7/8", 29/32". 31/32", 1", 1-1/16", 1-1/8", 1-5/32", 1-7/32", 1-9/32", 1-5/16", 1-3/8"), saving you time and efforts to change bits, quadrupling your drilling efficiency compared to competition. | Laser-Engraved Marks ----- All the laser-engraved reference marks make it easy to stop on any hole size for your convenience. | Universal Compatibility ----- Designed for drilling on steel sheets up to 0.2 in., acrylic, PVC and wooden boards up to 0.2 in.