Bottom bracket cups for Campagnolo Power-Torque (PT) version cranksets only. To fit the various sizes of press-fit style oversize (OS) bottom bracket shells.
The Campagnolo Power-Torque (PT) system is typically found on Campagnolo Athena, Veloce and Potenza cranksets ...with some exceptions.
Power-Torque OS-Fit BB30 68x42
Power-Torque OS-Fit BB86 86.5x41
Power-Torque OS-Fit PF30 68x46
Power-Torque OS-Fit BB30A 73x42
Power-Torque OS-Fit BB386 86.5x46