SEE card universal alloy drill bit (impact drill or Drill for heavy-duty hammer) is a French DIAGER plant manufacturing, marketing the Chinese market 20 years. Tensile steel for the overall high quality, super-hard alloy for the drill, by a special welding. Awarded the ISO9002 international quality assurance and many other verification. For mold steel, cast iron, granite, concrete and bricks and other high-temperature drilling works.