UnoDent Diamond Burs Cylinder FG No. 542 Coarse 542 Coarse 109-015C (835) 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. 542 Diamond Burs FG (Friction Grip) Coarse Grit - Cylindrical.