UnoDent Diamond Burs Truncated Cone FG No. 554 Coarse 554 Coarse 171-014C (846) Made with the finest Swiss-made steel shanks. Extensive range of shapes in all the most popular sizes. Triton™ bonded to double the strength of diamond adhesion and improve performance. Up to four grit sizes for all uses. Diamond Burs FG (Friction Grip) No. 554 Coarse Grit Truncated Cone.