NeoDiamondĀ® 2131 Acorn Diamond Bur by Microcopy (USA). High-performance single-use friction grip (FG) diamond bur featuring an acorn profile (1.8 mm diameter, 7.0 mm head length). Specifically engineered for occlusal surface shaping, anatomy recreation, cusp beveling, and controlled contouring of posterior restorations without cross-contamination risk.