ZVD - Piece hss Titanium Coated Step Drill Bit Set 4-12/4-20/4-32mm

[29 Sizes]: 3 standard size step drill bits have the following 32 sizes: 15 steps: 4-32mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 30mm, 32mm); 9 Steps: 4: 4mm (4mm, 4mm, 6mm, 4mm, 6mm, 8mm, 4mm, 8mm, 4mm, 6mm, 8mm, 4mm, 4mm, 6mm, 8mm, 4mm, 4mm, 6mm, 8mm, 6mm, 8mm, 10mm, 10mm. 2mm, 14mm, 16mm, 18mm, 20mm; 5 Steps: 4-12mm (4mm, 6mm, 8mm, 10mm, 12mm). A variety of drill bit sizes are perfect for your needs and save your time. [Premium Material]: These step drill bits are made of heat-treated 4241 high-speed steel with titanium nitride coating. Titanium coating to reduce friction and operate cooling, can effectively extend the life of life. Ladder structure: One drill bit can drill holes of different specifications, no need to buy multiple drill bits, saving space and money. Spiral slot: Provides faster, smoother cutting and a tri-flat shank to ensure a firm grip. Triangular round shank: Can be easily inserted into a drill, drill press, and press drill.