Sinus Osteotome, BOB-35. Sine Osteotome is designed for easy access in difficult area using the T-Bar handle. Using this instrument, a conventional osteotomy is made to the floor of the sinus. The concave tips create osteotomy and lift sinus floor simultaneously. The Sinus Osteotome is inserted into the osteotomy and gently tapped apically to separate and lift the cortical bone at the sinus floor. The diameter of working end is 3.5 mm. The depths are marked at 8-10-12-14-16 mm. • Exceptional Quality and Value priced hand instruments for dental, oral hygiene, surgical, veterinary, craft and hobby use. All products are made with the finest quality materials. • Our line of high quality dental instruments and precision tools are used in many applications including: Dentistry, Surgery, Veterinary , Scientific Laboratories, Forensic Lab, Industrial Companies, Crafts and by Hobbyists. • Choose from thousands of quality dental products from us. Send us an email if you have any questions about our products or have larger quantity or multiple items requirements.