The flail mower product line offers 4 different series:

EF flail mower         Light duty flail mower for small tractor with 15HP to 40HP with CAT I, 3-point hitch.
MD flail mower       It was named as EFGC model. Flail mower for small and middle tractors with 18HP to 60HP with Cat I/II, 3-point hitch.
MFZ flail mower      Middle duty flail mower for tractors with 25 - 65HP with CAT I/II, 3-point hitch. 20inch offset capacity.