The plug hole integral drill steel is widely used in stone pit
field to drill small holes.
Because of the integration of the drilling rods and drilling bits,
it can be metched directly with rock drills without shank adapter
or coupling sleeve, these advantages avoid the wastage of energy,
and improve the drilling efficiency remarkably.
Normally, it can be used for drilling holes in diameter of 17mm,
20mm and 22m on both hand-held rock drills and small rig-mounted