Features:
Good chip removal ability.
High-speed steel, nice quality & durable for use.
These drill bits works great in making a smooth, clean & perfectly round hole.
Professional design, which makes drilling holes more precise with smoother cutting.
Suitable for punch holes through sheet metal, steel plate, aluminum plate, brass or wood.
This drill bit set
Includes:: 3 sizes (4-12mm, 4-20mm, 4-32mm), which meet your different needs perfectly.