They look like the old Weaver variety that have been around since the 70/80's. I always considered them cheap, they were made of aluminum and easily warped.
You probably should upgrade to a newer set. Not necessarily steel but newer. There are many different styles out there, just depends on what tickles your fancy.
That looks like a Savage rifle you have there. I used a Leupold Long Range STD base on mine with Burris Signature STD rings.
This base has 1/4 degree of elevation milled in. I read or figured that out to be 1.3 feet @ 100yds. The rings also have the synthetic inserts in .000, .005, .010 or .020 and allow you to add even more MOA to your long range set up. This set up, depending on cartridge and scope, can allow the shooter the ability to dial out to 1200yds.
They are solid rings and mounts, do not require shimming or lapping of the scope and are a lot cheaper that the "tacti-cool" picatinny system. Good luck with your decision and happy shooting. JohnnyK.