H379 peri-implantitis bur for oral work and smoothing of titanium implants as part of the surgical/resective treatment of peri-implantitis, according to Dr Martin Durholt. Fine tungsten carbide, FGSXL 310 extra long surgical shank, size 023 (2.3mm) diameter, working length 4.2mm with 12 blades. Instrument length 30mm.