Material and coating - Selected 4241HSS steel with titanium coating provides excellent sharpness and extremely high durability due to the high speed steel base and titanium coating. This combination helps maintain cutting edges and extend tool life through demanding drilling tasks. Size and scope - 50 sizes (5 pieces) - The set includes 5 standard pieces, providing a total of 50 hole sizes. This wide range covers a variety of drilling needs, making it suitable for normal use and DIY projects. Tip design for reliable starting - 118° split point tip - The 118-degree split point helps start holes smoothly and provides fast, stable drilling on steel plates, aluminum plates, wood plates, and plastic plates. The plates should have a thickness less than the height of the step drill bit. Chip evacuation and efficiency - Double groove design - The double groove design promotes smooth chip removal, which helps reduce clogging and improve drilling efficiency. Practical use scenarios - Metal fabrication and repair Drilling clean holes in steel or aluminum sheets for mounting brackets or hardware, especially when multiple hole sizes are needed. - Woodworking and cabinetry Creating holes in wooden panels or boards for wiring channels, dowels, or fasteners with varying diameters. - Plastic and composite projects Drilling through plastic panels or acrylic sheets where a range of hole sizes is required without excessive wear on the bit.