Double etals casting that contain boron under the national standard of GB/T1150-1993 1.Double etals casting that contain boron under the national standard of GB/T1150-19932.Germany equipment,the grinding distrIbution,fine reclprocation.MODE: AD-50,DY-100,TB-50,GY6-125,GN-125,CBT-125,GS-125,WAVE-110,GY-80,LS-100,XF-125,TB-60,WY--125,LS--110,CG-150,JH-70. MOTORCYCLE CYLINDER