Type of push fittings to connect: 1/4', 5/16', 3/8', 1/2', suitable for 6mm 8mm 10mm 12mm OD tube. Material - Made of quality PU and plastic. High pressure resistance, long service life, can withstand strong pressure without tripping. Ideal for long-term use. Convenient design: space saving, 360 degree rotation, the release rings adopt the elliptical design, which can be removed easily. No additional sealing is needed, just a simple push to ensure a secure connection. Application: It is widely applied in automatic production equipment in industries like machinery, electronics, automotive, packaging. What you get: 40 pieces of fittings, including 10 for 1/4 inch, 10 for 5/16 inch, 10 for 3/8 inch and 10 for 1/2 inch, meeting your different needs.