Warne Vapor rails are designed to offer shooters an affordable and reliable mounting platform manufactured for your specific firearm. 15 MOA of elevation built in for longer distance shooting. Fits Savage Model 93/93r17/Mark II rimfire "E" receivers w/1.625" ejection port. Fits Picatinny & Weaver style rings and are NATO-STANAG compatible. Mounts to receiver with 6-48" screws.