Trephine Bur, TPHB-B4. For harvesting bone in autogenous bone graft placement. Laser marked score lines. Internally irrigated to minimize the risk of overheating the bone during drilling. Sold individually. • 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.