Harrison Design Extreme Service Beavertail Grip Safeties are CNC machined from bar stock, either stainless or carbon steel and are engineered to allow the craftsman to create that "hairline" joint beavertail installation that everyone wants. Dimensions are left oversize in the critical places, such as in the width of the center lug of the beavertail that fits between the frame tangs, eliminating the need to weld in between the frame tangs in the majority of cases. The side to side dimension of the 'tail is also left oversize to allow fitting flush with the flats of the frame. The fitting radii are machined undersize at a .240" radius to allow enough material for proper fitting of the beavertail to frames that have already been machined for a .250" beavertail by the factory and left a bit looser than desired. The blocking arm comes with the "Take Down" notch already cut for you.