Increases grip strength, promotes proper and consistent hand placement and improves recoil control for faster follow up shots. This rest has been redesigned to use trigger pin as part of the installation so only 1 screw has to be drilled into the frame. The Thumb-rest is semi adjustable for angle depending on where the front screw is drilled into the frame. It includes the proper drill bit. Machined from aluminum and includes stainless steel trigger pin. Installation is easy and only requires a punch, hand drill, and screwdriver.