... strength 2.Toughness good 3.wearability 4.High efficiency 5.Long service life A,DP Anchor drill bits is introduced,Product ... and use,1. High strength2.Toughness good3.wearability4.High efficiency5.Long service lifeIts capability is greatly improved on the base of ... greatly improves the wear-resistance and makes it efficient and long haul.D,Ruilong Consciousness,Quality is the enterprise's foundation of ...