The Duke No. 1 Single Long Spring Trap has a Jaw Spread of 4".  The number 1 Single Longspring trap is an all time favorite among trappers everywhere for catching muskrats, mink, and similar sized animals.   Many trappers prefer longspring traps for water trapping as the added weight of a longspring aids in quickly drowning the target species.  Also it is much easier to set a single long spring trap.