The intrafuse AR front sight tool is a four post model designed to work with the A2 front sight. Machined from 4140 steel and finished in black oxide, our tool will provide years of use and is backed by our lifetime warranty. The lanyard hole allows attachment to your key ring and provides a location to tie down the tool to prevent loss. Specifications: - manufactured from 4141 steel with a black oxide finish - lanyard hole - 100% U.S. Made..