Premium Quality: Aienxn compression fittings are made of solid , high quality and brass construction Premium Quality: Aienxn compression fittings are made of solid , high quality and brass construction Package Include: 1/2" 5pcs sleeve ferrules, 5pcs inserts; 3/8" 15pcs sleeve ferrules, 15pcs inserts; 5/16" 20pcs sleeve ferrules, 20pcs inserts; 1/4" 25pcs sleeve ferrules, 25pcs inserts, 3/16" 25pcs sleeve ferrules, 25pcs inserts, 1/8" 25pcs sleeve ferrules, 25pcs inserts; Total 230 pcs in a box Wide Application: The insert, sleeve ferrule, nut is commonly used to connect lines for water, air, fuel, oil and inert gases in a quick and simple way Features: Aienxn compression fittings have corrosion resistance, ductility at high temperatures and low magnetic permeability Timely Reply: If you have any questions, please email us and we will reply you within 24 hours