Does anyone know the maximum inside jaw capacities of both(the 3-jaw and 4-jaw) Harbor Freight 4" self-centering chucks?

The information that HF provided listed the 4" 4-jaw self-centering chuck as having a maximum inside jaw capacity of approx. 1.3" but that sounded too small to me. Is that correct?

Also, any information on the 4" 3-jaw chuck from HF would be appreciated.

Basically, I'm looking for a self-centering chuck to fit the asian(Seig) 7x12 mini-lathe with an inside jaw capacity of at least 1.5". Thanks for any information you can provide!

Rob