Diamond roller burnishing Tools: Smoothing and work-hardening even in small diameter Areas Diamond roller burnishing tools are a special feature of the Baublies product portfolio. They expand the range of applications of roller burnishing technology, as even hardened materials up to proximately 60 HRC can be roller burnished. The new Baublies combination tool makes turning, smoothing and strain hardening possible with just one clamping. Setup times are completely eliminated.