Bkl 300 rings - BKL Technologies 1in Long Double Strap Dovetail Rings, 300 Series, BKL-301

These are very stable, solidly made rings. Since the bases are one piece, they attach easily to a variety of rails as you can give them a little tightening before you slide them on from one end and have them stay in place as you adjust the position and tightness. If you follow directions and work back and forth, they stay in good alignment on the rails.
On this particular series the height is excellent for people like myself who prefer a more upright head position and there is a bit more clearance for ear muff style hearing protectors between your ears and the stock.
I liked them so much, I bought a second set for another rifle.