Premium Quality: compression fittings are made of solid , high quality and brass construction Premium Quality: compression fittings are made of solid , high quality and brass construction Package Include: 4pcs 1/8", 5pcs 3/16", 5pcs 1/4", 2pcs 5/16", 2pcs 3/8"; Total 18pcs in a box Wide Application: The compression fitting is suitable for oil, gas, water and other non-corrosive or corrosive pipeline systems, without welding and flaring tools, easy to disassemble, install and maintain Features: 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