... 1.Material:Spring Steel 65Mn,SUP6 2.HRC:38-45 3.Plain Disc and Notched Disc 4.Diameter:12"-30" ... casting,grinding and heat treatment,Each blade can meet your requirement.Meanwhile,all of blade materials are spring steel 65Mn, ... (mm)1230533/41913330312514355311/238164103/3.511/2 , 17/8 , 238/47/51174303/3.5/421/457184603/3.5/411/2 , ... 521/263225603.5/4/5/621/2 , 23/4 , 3 , 31/463/70/76/83235853.5/4/5/631/ ...