Thanking you for responses,
Scuba, hooks are measured in (lack of a better term) hook size. Mustad size 1(one) is different from Gamakatsu size 1 (one). And to compound this mess, some of the various size hooks are exactly the same size.
Most places that sell Gama Circle hooks and most all brands, put up pictures of the hooks that are exactly the size of the hooks pictured.