The williams™ Slot Blank 3/8" Dovetail 1951 is designed to protect the 3/8" dovetail slot on any firearm. The Williams™ Slot Blank 3/8" Dovetail 1951 provides your firearm with a continuous smooth look when open sights are removed from the firearm. In addition, The Williams™ Slot Blank 3/8" Dovetail 1951 installs easily to your firearm using one simple locking screw to hold the slot blank in place.