Bone Spreader Osteotome, BOC-35. Bone Spreader is designed for easy access in difficult area. This instrument is used to expand narrow alveolar bone for implant surgery. Using our Mallet and Bone Chisel, first make alveolar bone fracture and then use this spreader to expand the bone fracture. The oversize T-bar handle allows for easy handling and less effort. The diameter of working end is 3.5 mm. Product Code: BOC-35