Set of Optilock blued 30mm low rings, model number S1300929.
In great condition with original packaging, instructions and allen key.
I was using a 50mm scope with a standard weight Sako, and had plenty of objective clearance over the barrel, even with a Butler Creek lens cover. I'm quite certain that a 56mm scope would fit, whilst still being as low to the bore as possible -see attached images.
Also for sale elsewhere.