Some of the most heavy duty steel carabiners on the market, the Escape Climbing Steel Anchor Carabiners are designed to stand up to the wear and tare of commercial climbing gyms. These are specifically made for Top Rope Systems in gyms. Because they are made with steel they are more abrasion resistant and have a much higher strength compared to aluminum carabiners.
These Carabiners also work in other rescue or work at height situations where high strength is needed and where weight is not an issue.
As a reminder, consistently check your gyms safety systems for signs of wear.