S&W 940 and Ruger SP101
These moon clips are designed to work in the S&W 5 shot J Frame Model 940 and 442 revolvers chambered in 9 MM.
These also fit the OLDER Ruger SP101.
NEWER Ruger SP101 require a 0.020" thick moon clip.
These moon clips are 0.036" thick, made from Stainless Steel.