The 3” QUICKFIST mounts hold objects from 2.75” to 3.50” (70-83mm). Its design is very similar to the original QUICKFIST mounts, but more than 3 times larger. Extremely robust, it will securely hold a safe working load of 50lbs or 23 kilos (its break strength is 150 lbs or 68 kilos). The 3” QUICKFIST mounts were originally designed to hold fire department’s hose nozzles. But a single clamp is also excellent for securing a 3” diameter fire Extinguisher on ATVs, motorcycles and trucks.