1.Founded in 1989 2.Professional manufactuer 3.ISO9001 passed 4.Exported Europe,North America,Mideast, South East Asia so on ---Professional quality1.Designed to cut accurate holes in mechanical materials up to 38mm or 44mm thick. 2.Used in portable electric tools, air tools, drill presses,lathed, boring milling machines and some other machines,which have rotating spindles.3.Material: M2,M3 and ...