The Weaver Picatinny Riser Set is a sleek, lightweight option for mounting a wide range of optic and ring combinations on AR-style rifles. This riser set is engineered according to the Picatinny specifications for mounting firearm accessories. This riser set increases the rail height by 0.5 (25.4mm). This riser set features an additional mounting slot so that you can position your optic exactly where you need it. It is constructed using aircraft-grade 6061-T6 aluminum with type III hard coat anodized finish. This Picatinny Riser Set is built for duty.Features:- Adds 0.5 (25.4mm) height to Picatinny rails - Designed based on Picatinny specifications - Minimizes weight and bulk - Longer rails add extra mounting slot included - Provides optimal mounting height for a wide range of optic and ring combinations on AR-style rifles