These apparently fit a K,L,N frame according to the website and following models
Round or square-butt frames: Models 10 thru 29, 48, 53, 56, 57, 58, 64 thru 68, 242, 329, 396, 520, 547, 581, 586, 610, 617, 624, 625, 627, 629, 648, 657, 686 and 696.
* Will not fit K-Frame Scandium revolvers.