Beijing Dazheng Yongye Construction Mahinery Co.,Ltd ,founded in 2008 ,with more than 8 year`s manufacture experiences in Rotary drill spare parts ,is specialized in supplying variours drilling tools ,include bullet teeth (round shank cutter bits ,cutting bits,drilling teeth ),drill bucket.,core barrels,drill augers,kelly bars,speed reduces.Our products get widely approved in construction and foundation field because of their durability,robust construction,corrosion resistance and easy operations