Surgical Bone Expander Screws Saw ToolNewMed® Surgical Bone Expander Screws Saw Tool Kit is a specialized tool used for bone expansion in surgical operations. This 1.8/2.6 kit mm, consists of 2.2/3.0 mm, five expander screws with different diameters and lengths such as 2.6/3.4 mm, 2.9/3.8 mm, ..