The Hunter Safety System HSS Carabiners are made of high-tensile-strength aluminum, with a strength rating of 5,600 lbs. with the screwgate in its locked position. Ideal for use as replacements for the steel carabiners that come with HSS Lineman's Climbing Straps, Life Lines, Quick-Connect Straps, and Rope-Style Tree Straps. 2 pack. Made of high-tensile-strength aluminum Strength rating of 5,600 lbs. Screwgate in its locked position