British standard spockets are made to suit the British standard (BS) roller chains.
Sprockets to suit BS 1 Inch pitch roller chains.
Sprockets to suit BS 1/2 Inch pitch roller chains.
Sprockets to suit BS 1/4 Inch pitch roller chains.
Sprockets to suit BS 1-1/2 Inch pitch roller chains.
Sprockets to suit BS 1-1/4 Inch pitch roller chains.
Sprockets to suit BS 3/4 Inch pitch roller chains.
Sprockets to suit BS 3/8 Inch pitch roller chains.
Sprockets to suit BS 5/8 Inch pitch roller chains.