This compact tool is essential in your AR15 field kit or range bag. It will adjust the height of both “5 notch” A1 and “4 notch” A2 Front Sight Posts – even the flip-up sights with taller “ears” on either side of the sight post. Machined from high quality steel with a manganese phosphate finish. The central knurled grip has identifying grooves machined in: one for the A1 side, 2 for the A2 side. Made in the U.S.A.