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.

Mask machine is a machine used for automatic production of multi-layer flat masks such as N95 masks and surgical masks. Tungsten carbide drill that plays the role of drilling on the mask machine is made of fine-grained cemented carbide, which has high strength, good toughness, high temperature resistance, good corrosion resistance, high hardness, good wear resistance, smooth chip removal, and small calorific value for drilling.

Tungsten carbide core drill can be a cost effective means of drilling through softer unconsolidated formations. And such a core drill is applicable to hole cutting and process of annular groove on various magnetic drills and press. Tungsten carbide does not possess the hardness of diamond, while it is relatively cheap compared with diamond drill. It cuts effectively at low r.p.m. (revolution per minute) and low weight on bit.

WO3 nanopowder is an n-type semiconductor with wide extending applications. For example, nano WO3 is widely applied to produce functional ceramic. And the prepared functional ceramics show good nonlinear electrical properties characterized by low voltage and small current. Some experts have used nano WO3 and CeO2 powders to prepare CeO2 doped WO3 ceramics to study the effect of initial powder nanometerization on ceramic properties.