Replacement boron nitride (CBN) hone stones bars set (6 pcs) for Rottler HP6A, HP7A, H85A, H85AX, H85AXY, H86A, H86AX, H86AXY, H87AXY honing machines For Rottler, Sunnen honing machines with following specs: Replacement for stones 514-9-35B but with same high quality Grit is 600 Length is 3″ inches (76 mm) Height & width 0.312″ inches (7.9 mm) Finish Ra. is 8-12 For super finishing I work with it on my own Rottler HP6A honing machine