NeoBurrĀ® RA 6SL Surgical Length Round Carbide Bur by Microcopy (USA). Engineered from a single piece of solid tungsten carbide with an extended surgical length right-angle latch shank (RA SL) and a substantial 1.8 mm round cutting head. Specifically designed for low-speed surgical contra-angle handpieces, controlled osseous recontouring, bone guttering, unroofing pulp chambers, and excavating deep carious dentin near the pulp where high-speed turbine exhaust air must be eliminated to prevent surgical emphysema.