This is a brand new stainless steel strain screw for Smith & Wesson K, L, and N frame square-butt revolvers that use the flat-leaf type mainspring. Measures .605" OAL and .480" under the head. Fits models: 64 ,65, 66, 67, 610, 617, 624, 625, 629, 648, 657, 681, 686, and maybe more.
I have the shorter round-butt screws here.
