1. The thread drill bits are made by high quality alloy steel bar and famous brand tungsten carbide,quality standard same as global brand such as Sandvik and Robit etc.2. The thread type includes R25,R28,R32,SR35,R38,T45,T51, ST58, GT60, ST68 and so on.3. The drill bit head diameters range from 32mm to 152mm.4. The buttons have different shapes,such as spherical,ballisticand conical.5. The face shapes include flat shape,drop-center shapes and engrave shapes,the body shapes have normal and retrac shapes.6. The threaded drill bit is widely used in tunnel construction, large scale mining, such as open-pit and underground copper,gold etc mining.