1.常用款合金三角钻头，硬度高耐磨性好！
2.高档款金色螺旋三角钻，出尘速度超快，工作效率更高！！
1. Commonly used alloy triangular drill bit, high hardness and good wear resistance!2. High-grade gold spiral triangular drill, dust speed ultra-fast, more efficient! The
