Trephine drill is used for biopsies, harvesting, or for the removal of a dental implant. Specifications: - The Trephine Drills have depth markers at 2, 4, 6, 8, 10, and 12 mm. - Length: Long. Set contains: - 8 x Trephine drill diameter (external/internal) 2/3, 3/4, 4/5, 5/6, 6/7, 7/8, 8/9, 9/10. - 1 x Stand.