All new S&W frames are Round Butt. These grips are designed to fit the Round Butt but are full "Square Butt size" grips. They "convert" a small Round Butt to a full size grip.
Fits: Smith & Wesson K or L Frame, Round Butt, Monogrip with Wood Big Butt
Fits: Smith & Wesson K or L Frame, Round Butt, Monogrip with Wood Big Butt