NEW Bone Expander Screws Kit Alternative To Osteotomes For The Expansion And Condensing Of The Atrophic Mandible And Maxilla. Non-traumatic progressive Expansion technique - gradual approach to expand the bone for implant. Special Advantages: Titanium NiTride Coated Threads prolongs the life of the Screws. Color coded for ease in identification Laser Depth marks on 8.0mm, 10.0mm, 11.5mm & 13.0mm The Kit Contents: 1) Expander Screws - 1.8 / 2.6mm - 2.2 / 3.0mm - 2.6 / 3.4mm - 2.9 / 3.8mm - 3.3 / 4.3mm