6Pcs 4/5/6/8/10/12mm Drill Bit Efficient Universal Drilling Tool Multifunctional Cross Cemented Carbide Drill Bits Tools

Produktbeschreibung

*100% brand new and high quality. *It is made of high quality alloy as raw material. The process of oxynitriding of the cutter head strengthen the drill hardness. *Full-grinding and anti-rust treatment, clean and sharp without burrs .The drill bit is more wear-resistant and more durable . *Fully automated polishing: Polished CNC is fully automated, each one is unified. *Small incision resistance，feature drilling stably, fast speed, not breaking the border. Opening neat, smooth, no broken edges, no tremor phenomenon, chip easily.