1. This is the new HSS steel big step cone drill bit titanium alloy drill bit set,
2. Made of high-quality HSS steel and plated with titanium to reduce friction and heat.
3. Very suitable for cutting holes of various materials, including thin steel, brass, wood, plastic, etc.
Type: Pitch drill
Material: high speed steel
4-12mm 4-6-8-10-12mm 5 steps
4-20mm 4-6-8-10-12-14-16-18-20mm 9 steps
4-32mm 4-6-8-10-12-14-16-18-20-22-24-26-28-30-32mm 15 levels