Raws li pom hauv daim duab sab xis hauv qab, dome PDC thiab carbide inserts tau muab tso rau hauv tib lub percussion bit. Tom qab sim, cov carbide inserts tau hnav tawm.

Raws li pom hauv daim duab sab xis hauv qab, dome PDC thiab carbide inserts tau muab tso rau hauv tib lub percussion bit. Tom qab sim, cov carbide inserts tau hnav tawm.
