The add-on riser rail provides an additional 1/2 inches of elevation or offset, which is occasionally necessary for mounting a red dot sight, light, laser or other essential accessories. It securely clamps onto any MIL-STD-1913 picatinny rail and offers three picatinny cross-slots. The steel crossbolt and oversized, hex-head slotted thumbscrew facilitate quick and easy installation and removal, with or without the use of tools. The hardcoat anodized finish is a durable, corrosion-resistant surface treatment that enhances the longevity and performance of metal components Crossbolt/Thumbscrew crafted from 4140 steel, featuring a durable black oxide finish for enhanced corrosion resistance and a professional appearance