Larry, The 15CDT I received has a 3/16" blade, so it would not fit the standard handle channel of a non CDT. The Model 4 4.5" blade is to be 3/16" (small game) and the the Model 4 5" (big game) is to be 1/4" as per web site. My Model 4 5" received is 3/16". Good news is I can use on both small and big game. Hope that make more sense.