Our carbide bits use  thickened  type alloy brazing sheet, convenient for regrinding,reliable performance,long service life,and strong adaptability to properties of rock mass.Ofen work with  light diesel, electric, hydraulic and pneumatic rock drill, drilling various types of rock hole diameter below Φ50mm. Because of its reasonable price,it is still the main carbide bit for our country's mining industry. Specificaions of our bits:28,30,32,34,36,38,40,42,43,45,50etc,Suitable for coal, iron ore, quartz sands, tungsten, gold, copper, lead-zinc mining, railways, tunnels, highways and other construction.