These are used on small ID hose for air, water and other fluids (non-critical applications). They are an economical alternative to heavier, longer crimp sleeves such as our WI- and WCSeries. They must be installed with larger crimping machines to provide a smooth, uniform grip. They can be used with N400/N400L brass or stainless barbs, N32D 2-Lug Universals, Series A Double Lock Cplgs, and Series B Twist Lock Cplgs.