Hogue® Rubber Grips provide a secure handhold with an ergonomic shape. Monogrips are an open backstrap. Fits the Ruger® New Model Blackhawk® with the XR-3 frame (does not fit the old XR-3 Frame- 3 screw model), Ruger® New Model Super Blackhawk®, Ruger® Single-Six®, Ruger® New Model Single-Six®, and Ruger Vaquero®. Made by Hogue® Does not fit the Hunter model Ruger Super Blackhawk® with round trigger guard. Does not fit models with internal lock.