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The second columns allow the lab to specify the pin beveling for rimless frames; often, a lab will pin bevel both the front and the back of a rimless lens, for cosmetic reasons.
A value of 0, such as used in the "Regular Front" example here, causes pin beveling not to be done.
The lab may also click "Bypass pin bevel settings", which causes pin beveling to be suppressed for all jobs (PINB=0, FPINB=0).