1.15years professional manufacture 2.tct,TCT ,t.c.t hole saw 3.cutting stainless steel 4. ISO9001 5.export:USA,EUR,JAPAN 1.from stainless steel to wood to synthetic plastic sheeting ,iron may be dis played ,ultra-performance of perforation.2.The blade and drill body are bimetal products that are made by adapting two kinds of materials such as M42 high-speed steel and spring steel.3.The design of ...