Brass Compression Sleeves Ferrules & Insert and Nut Brief Description: You'll get 280 pieces of compression fittings including compression sleeve ferrule, and Insert of 6 different sizes for your convenience Sizes: 1/4 inches- 60 pcs compression sleeve ferrule, 15 pcs compression insert. 3/8 inches-40 pcs sleeve ferrule, 15 pcs insert. 5/16 inches- 30 pcs sleeve ferrule, 10 pcs insert. 1/2 inches- 20 pcs sleeve ferrule, 5 pcs insert. 3/16 inches- 50 pcs sleeve ferrule, 10 pcs insert. 1/8 inches- 20 pcs sleeve ferrule, 5 pcs insert High-Quality Material: Solid , High Quality and durable brass construction. Lead Free, Corrosion resistance, ductility at high temperatures, and low magnetic permeability Easy to Use: These fittings are easy to assemble requiring no soldering, flaring or deburring. Standard Compression Fittings are suitable for a wide variety of applications Applications: This brass compression kit can be connected to copper, brass, aluminum, or plastic tubing. No flaring tool is required for assembly.It can keeps plastic tube from collapsing when tightened. And prevent leakage