These are Ruger New Vaquero grips for frames with a back strap that measures 7/16" wide (XR3 Frame). Models included New Vaquero and SAS Vaquero. Due to the rough cast nature of Ruger frames the fit of grips may vary and may also require fitting. Some of the best imitation ivory on the marked, showing a more realistic "grain" not just a solid plain color like most fake ivory.