A500k mini pot, long shaft, typically used for volume pots on humbucker guitars

A500k mini pot, short shaft, as above just shorter mounting typically for through scratchplates

B500k mini pot, long shaft, typically used for tone pots on humbucker guitars

B500k mini pot, short shaft, typically used for tone controls with humbucker on scratch plates

A250k full size CTS type pots with short shaft used for single coil volume controls through scratch plates

B250k full size CTS type pots with short shaft used for single coil tone controls