The drill bit set is made of alloy material. The oxynitride treatment of the cutter head enhances hardness. Surface electrophoretic painting process provides improved durability. The drill set undergoes comprehensive rust-proof grinding treatment, resulting in a clean, sharp edge without burrs. The bits are wear-resistant and long-lasting. Fully automated polishing ensures consistent quality. Unique cross-angle design reduces cutting resistance, enables stable drilling performance, and allows for fast drilling without chipping. Creates clean holes with smooth edges, no wobble, and easy chip removal. Includes 5 different sizes to meet various application needs. Compatible with standard electric hand drills and bench drills. Requires a chuck size of 10mm or larger.