... tungsten rotary cutters 2.Material:hard alloy(YG8) 3.Standard:ISO775,American Standard,DIN etc 4.Surface treatment :titanizing or according to ... are all made of YG8(equals to K30 as to International Standard) 8.others are accepted for all kinds of non ... Rotary Files. Our products are produced according to ISO775 standard , American Standard and DIN standard If you are interested it ,please contact me