These quality steel rings from ISC are rated to 70kN. They are made with 11mm bar stock. Fully marked. Large: Internal Diameter = 45mm (1 3/4")Outside Diameter = 70mm (2 3/4") • (MBS) Minimum Breaking Strength (kN): 70kN• (MBS) Minimum Breaking Strength (lbf): 15736• Weight (grams): 155• Weight (ounces): 5.5