CoroBoreĀ®Ā BR20 is a twin-edge multi-purpose tool for rough boring. The system consists of adaptors with matching slides, shims and covers, making it possible to adapt the tool to various materials and conditions. Ā Application area Ā Ā Rough boring Twin-edge boring, step boring and back boring Damped Silent Toolsā¢ solution for vibration-sensitive applications Standard inserts with dedicated grades and geometries for all materials CoroBoreĀ®Ā 111: Optimized for rough boring applications CoroTurnĀ®Ā 107: Wide selection of grades and geometries ā