Constructed of strong, lightweight aluminum with six holes for added strength. Large locking nut secures to Weaver-style bases. Available: Medium Height, High Height, Extra-High Height.
I use them on my Savage 308 and they work good for what there intended for. Identical to the Weaver tactical rings (just renamed to BlackHawk exclusively for Cabelas). Seem very durable and have had no problems holding zero at all. Overall, pretty good rings for the price.
I bought 308 win. put the blackhawk one piece mount on it with the multi-slots. These rings are easy to install easy to get your scope level. I would recommend them to anyone. They are the best mounts I have used. Looks cool too.