Our main material for chipper knife is DIN 1.2631, A8 Some size in common use:BX216 600×180×20MMBX218 780×220×20MMBX218A 875×220×20MMBX218D 850×220×20MMBX2113A 780×220×20MMBX2113C 665×220×20MMBX1710 258×75×6.5MMBX1216 482×110×14MMBX1112 342×110×14MMBX2110 540×220×20MM700×188×20MM634×290×20MM669×290×25MM880×180×16MM665×220×20MM