1.15years professional manufacture 2.tct,TCT ,t.c.t hole saw 3.cutting stainless steel 4. ISO9001 5.export:USA, ... be dis played ,ultra-performance of perforation.2.The blade and drill body are bimetal products that are made by ... speed steel and spring steel.3.The design of unbalanced saw and side teeth can ensure fast trepanboring, scrap discharging ... E041132 TC-E041235 TC-E041338 TC-E041440 tct hole saw