The Barska Dovetail to Picatinny/Weaver Rail Converter allows you to use today's standard-mounted optics, sights, lasers, and weaponlights on the older mounting system that was common on hunting rifles without the expense and hassle of taking it to a gunsmith. Measuring 4.75" long with a height of 1/2" it is made of a strong and lightweight aluminum alloy treated with an anodized matte-black finish.