DM10 FG 314, size 009 (0.09mm) with cutting depth of 1mm. PrepMarker burs are designed for marking the required depth prior to the actual preparation. The rounded step above the diamond coated working part, prevents inadvertent excessive preparations. The instruments are available in 4 versions. 0.5, 1. 1.5, and 2mm. The correct depth can be identified at a glance, thanks to the clearly visible laser mark on the shank. PrepMarkers can be used for all kinds of depth marking as a prepatory measure for veneers, inlays, onlays, overlays, occlusal onlays, crowns & bridges.