Width Listed is Outside..

SC-50     70mm outside / 50mm inside  (1T Websling)

SC-75     95mm outside / 75mm inside  (2T Websling)

SC-100  120mm outside / 100mm inside (3T Websling)

SC-150  170mm outside / 150mm inside (4T & 5T Websling)

SC-200  220mm outside / 200mm inside (6T Websling)

SC-250  270mm outside / 245mm inside

SC-300  300mm outside / 275mm inside