dear sirs, Guiyang steel mills is one of the key special steel manufacturer in china, rank one of the 500 largest enterprise in China. also one of the largest rock drilling tools producer in ASIA AREA.  exporting items include: --alloy steel bars(round and hexagon ) tool steel, mould steel, bearing steel ,free cut steel, carbon steel,forging die. and etc. such as H11,H13,H21,P20, S1,S5,S7,4140,4340,8620, and etc. --rock driling tools hollow steel bars, drilling rod. button bit taper rod,  integral drill rod, shank adaptor, coupling , and etc. --Bright steel rod and mould components : Include silver steel round rods, ejector sleeves, straight leader pins, shoulder leader pins, dowel pin, shoulder bushing, hotwork ejector pins ,