Meprolight : Product ID: 6522 :
MFG# 40441 : Meprolight Hex Nut Tool for Glock, Sigma, and Walther Front Sights, MPL40441
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Some Meprolight front sights secure by use of a tiny, hex headed screw. This steel tool is for safe, quick installation of the hex screw to tighten down a tritium sight. Can also be used on some Trijicon front sights. Fits 3/16" hex screw.