XS Tritium stripe front sight for the AR features precision machined stress proof steel” a vertical tritium vial” and white outline to provide front sight visibility in any lighting condition. 0.105″ square top post. Each full rotation of front sight gives a 5″ shift at 100 yards. Made in the USA. Fits AR front sight housing with front sight detent at 3″ 6″ or 9 o’clock.