Mira BB Counterbore Unit and BB-EXT250 Extension Shaft
The Mira BB86 if a Portable unit simple to use to recut Diesel sleeve counterbores. Guaranteed a perfect seal between engine block and liners, the counterbore seat of an engine block must be refaced during engine overhaul in case of leaks. The extension for refacing deep seated counterbores. Up to 200mm in depth with this special extension unit. Adaptable on all genuine Mira BB86 units.