... Mining and Rock DrillingThe strength and wear resistance of inserts are improve1. Roller bits for Mining and Rock ... DrillingThe strength and wear resistance of inserts are improve by using carbide inserts with high strength and high wear ... medium formation, hard formationButton bitsmall tooth, big tooth,conical inserts,chisel insertsMeterialalloy steel,carbidePackingwood box, steel boxPaymentL/C,T ...