
Tungsten carbide hollow drill, which is called annular cutter when it is used in metal, is a drill specifically designed to remove a cylinder of material, much like a hole saw. Tungsten carbide hollow drill bits are used for many applications, either where the core needs to be preserved, or where drilling can be done more rapidly since much less material needs to be removed than with a standard bit. More details, please visit: http://www.tungsten-carbide.com.cn/tungsten-carbide-drill.html Tungsten carbide hollow drills can…