XS Standard Dot Tritium front sight for the AR features precision machined stress proof steel” a white ring” and green tritium center for visibility in any lighting condition. Outside Diameter Standard Dot 0.140″. 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.