Founded in 1971, Ningbo Tiangong Great Star Tools Co.,Ltd. is China Masonry Drill Manufacturers and Concrete Drill Bit Factory.As An important production base for the production of hand tools, the company covers 30 thousand square meters, building area covers 23 thousand square meters. Tiangong has more than 280 employees and sales amount was 20 million USD in last year. Its main products include hand tools, wood chisel, wood plane, flat wood bit,cold chisel,SDS&masonry drill bit, file&rasp etc. Company passed ISO9001 and BSCI quality management system, and GS, TUV product quality certification. Our Wholesale Concrete Drill Bits are exported to over 30 countries such as USA,Germany,Japan,Spain,Italy,UK,Korea,Australia,Canada and etc.