A. This step drill set is treated with a titanium coating, which provides heat resistance, corrosion resistance, and rust prevention. It can reduce friction and maintain a low temperature during operation. B. The chip flutes are designed for relatively faster, smoother, and cleaner cutting. C. The center punch provides relatively precise positioning without obvious deviation or bending. D. Straight fluted step drill bits. E. Suitable for drilling in a variety of materials, including steel, brass, wood, plastic, etc. F. Material: Steel. G. Color: Yellow. H. Package contents: - 1 set of drill bits (6 pieces in total). I. Only the above - mentioned package contents are included, and no other products are provided. J. Note: Light reflection and different displays may cause some slight differences between the item color and the actual object. A measurement error of ±1 - 3 cm is allowed.