The new depth markers indicate the required preparation depth before preparation. The preparation depth is lasered on the shank. Depth markers for areas of crown and bridge work such as ceramic crowns, overlays and onlays. The depth marker is ideal for preparing shallow depths (0.5mm, 1.0mm, 1.5mm and 2 mm). It has a high-grade diamond-coated working section with subsequent wide neck, which automatically stops deeper penetration with the depth marker, preventing an excessively deep preparation. This guarantees a high degree of reliability for the operator, also particularly in the case of CAD/CAM restorations which place high demands on preparation.