Roller burnishing is a surface finishing technique in which hardened, highly polished steel rollers are brought into pressure contact with a softer piece part. Standard tools available from stock for inside diameters from 3.97 to 178mm (0.156-7.008"), and for outside diameters from 1.0 to 65.1mm (0.039-2.563" inches).
COGSDILL ROLL-A-FINISH EXTERNAL BURNISHING TOOL .312 dia
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Roll-a-Finish Burnishing Tools by Cogsdill