For .458 .375 & .450 Back-up iron sights, flip up design, 6061-T6 aluminum, with green rear fiber optic inserts and red front fiber optic inserts.
These are for same-plane installation on top of receiver/hand guard, flip straight up, fold flat. Front and rear sold as a set.
Not for use on picatinny rail gas blocks.
Elevation adjustments are made by screwing the front sight post up or down. An adjustment tool is quite handy for this procedure.