Code on Axminster Clubman SK100 chuck

Can anyone help me please. I have an Axminster Clubman SK100 chuck. I no longer have the lathe I used it on and have forgotten the thread size. It has a code on the side T01 Does anyone know what that means?
Thanks

T01 refers to the thread size. Please see: Which Chuck Is Right For Me? | Woodturning Chucks | Axminster Tools