These are Ruger Vaquero/Blackhawk grips for frames with a backstrap that measures 1/2" wide (XR3-RED Frame). Models included Blackhawk, New Blackhawk, short barrel Super Blackhawk, Old Army, Vaquero, Single Six, and New Single Six. Due to the rough cast nature of Ruger frames the fit of grips may vary and may also require fitting. Polyester Composite Pearl Grips.