Key Features:
1. All drill bits are made from high speed steel, fully precision grounded, heat treatment and hardened, and titanium coated for longer lifetime, faster and accurate cutting
2. All drill bits are produced with 1/4″ (6.35mm) integral hex shank for quick change, less runout and better performance
3. HSS step drill and cone drill bits: recommended to cool down with water during use for better performance and extended lifetime; suggested drilling speed is 250-400RPM/min
4. Automatic brass center punch provides high impact spring-loaded strike when pressed against working surface; striking force is adjustable by turning cap
5. Whole set packed in solid injection plastic box, with carved EVA inlay and two plastic holders
Included Pieces & Sizes:
3-piece HSS step drills: 5 steps drill (4, 6, 8, 10, 12mm), 9 steps drill (4, 6, 8, 10, 12, 14, 16, 18, 20mm), 14 steps drill (4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32mm)
1-piece HSS cone drill: 8 – 20mm
6-piece HSS countersink drill bits: 6.3, 8.3, 10.4, 12.4, 16.5, 20.5mm
1-piece HSS drill saw: 6mm
1-piece brass automatic center punch