4.00mm PCB Drill Bits Set Cemented Carbide Tungsten Steel Mini Drills for Printed Circuit Boards CNC Drilling 10Pcs Pack Perfect For Electronics Prototyping And DIY Projects

Compact 4.00mm PCB carbide drill bit set, 10 pcs
✔️ 4.00mm flute, 3.175mm shank, 12mm flute, 38.10mm OAL (~1.50")

These are precision carbide PCB drill bits designed for drilling holes in printed circuit boards and small prototyping projects. They’re ideal for electronics hobbyists and DIY CNC setups that require clean, accurate vias and through-holes on FR4 and similar materials.

✅ 4.00mm flute diameter (~0.157") for precise PCB holes
✅ 3.175mm shank (~0.125") fits standard drill chucks
✅ 12mm flute length (~0.472") and 38.10mm overall length (~1.50")
✅ Cemented carbide tungsten steel, no coating; 10 pcs pack

💡 What is a carbide PCB drill bit used for in electronics prototyping and DIY PCBs?

These handy bits help create clean, accurate holes in PCBs and related materials during prototyping and hobby machining.

• High hardness carbide delivers long wear life when drilling FR4, acrylic, and phenolic boards
• 4.00mm size is handy for vias and pilot holes in hobby projects
• Cemented tungsten carbide with no coating minimizes burrs and ensures straight holes
• Compatible with hand drills and CNC machines for electronics prototyping