Titanium Coating for Durability: Crafted from high-speed steel and coated with titanium, these step drill bits offer enhanced and resistance to heat, , and rust, making them ideal for tough metal drilling tasks. Versatile Drilling Performance: Designed to penetrate steel sheets, aluminum, wood, and plastic, this set provides clean and precise holes, suitable for both professional engineering and DIY home projects. Efficient Dual-Flute Design: Each bit features two straight flutes that promote rapid chip removal and produce cleaner holes, ensuring optimal drilling performance and smoother cuts in various materials. Secure Tri-Flatted Shank: The bits come with a tri-flatted shank design that ensures a strong grip and prevents slippage in drill chucks, enhancing safety and efficiency under high torque applications. Comprehensive Set for Multiple Needs: This kit includes five step drill bits covering 50 sizes ranging from 3/16Inch to 1-3/8Inch, housed in a aluminum case, providing versatility and organization for all your drilling needs. Color:As Shown Material:Bearing Steel Package Contents: 1 * woodworking drill bit kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.