Product Features:  

the product is made of steel, after special heat treatment  

A variety of different design to adapt to different operating environment, product direct 28mm to 100mm,  

(3) various taper (7°, 11°) connected taper hole bit  

Practice has proved that the drill bit is suitable for drilling hard strata such as carbonate rock, limestone, chalk rock, clay rock, siltstone, sandstone and so on. Compared with the general drill bit, especially drilling rock strata of grade 6 ~ 8, the drill bit has a remarkable effect.