Nikon 16155 S-Series Steel Riflescope Rings, Low;

S-Series Low Rings Black Matte (Steel)

The NIKON S-Series Low Steel Matte Black Rings (16155) incorporate a square, stainless steel recoil control key in both the front and rear rings.
This ensures a "no slip" positive recoil surface across the entire Slot of the base that is capable of withstanding extreme recoil.
They utilize four T-15 Torx-style socket cap screws per ring for secure optics mounting for increased strength and riflescope alignment.
The ring band width is also substantially wider than typical rings, offering more ring-to-scope clamping area to hold the riflescope firmly in place.