Bottom bracket cups for Campagnolo Power-Torque (PT) cranksets only. To fit threaded bottom brackets.
The Campagnolo Power-Torque (PT) system is typically found on Athena, Veloce and Potenza cranksets ...with some exceptions.
ENG English threads (1.370 inches x 24 TPI)
ITA Italian threads (36mm x 24 TPI)
Power-Torque BB cups - ENGLISH threads
Power-Torque BB cups - ITALIAN threads