The Glock front sight is held on with a screw. Neat idea, but up until now there was no way to get to it. If you own or work on Glock's, you need this tool! This specially designed tool will slip into the many types of magnetic screwdrivers, and allow a professional installation of the Glock front sight screw. Fits all Glocks. Certain Glocks may require opening the hole in the slide just slightly.