... Huachen Abrasives and Abrasive Tools Co.,Ltd. is a professional grinding wheel manufacturer with more than 45 years ... reduce the deformation of the workpiece and have a good cutting techologyBrown aluminum oxideAGreyGreat toughness,high hardness,flesural ... strength.It can withstand a lot of pressure,and it has a very with range of applicationPink ... ,A80,A100,A120,A240. Hardness:K,L,M,N,P,Q,R,S