材质
Tungsten Carbide, high quality tungsten carbide
Product name
Coal Mine Drill Bit
Diameter
25, 27, 28, 29, 30, 32, 36, 42 mm 43m 45mm etc.
Thread
R22 M14 M16 or straight shank
Color
gold, blue, black, red..etc
Application
coal mine, iron mine, goldmine, etc
Advantage
Fast Footage Speed