Made from durable 6061-T6 aluminum, the Sightmark 34mm Medium Height Weaver/Picatinny Mounting Rings are the perfect accessory for securely mounting your trusted optical sight. With a non-reflective matte black finish, the lightweight rings fit both Weaver and Picatinny rails. Designed for 34mm barrels, the Sightmark rings come complete with an Allen key for easy adjustment.