Save time and effort, accurately evaluate trigger function and pull weight without installing and removing the slide each time. Slides onto the frame rails and locks solidly with a thumb screw; nylon pad cushions hammer fall, prevents damage to hammer and frame. Greatly simplifies action tuning and trigger work on 1911 Auto pistols. Does not interfere with safety or disconnector operation. Mfg: Brownells SPECS: Aluminum, silver anodized finish. 1" (2.5cm) long, 1" (2.5cm) wide.