Types of push-fit fittings for connection: 1/4", 5/16", 3/8", 1/2", suitable for 6mm, 8mm, 10mm, and 12mm OD tubing. Material - Made of high-quality PU and plastic. High pressure resistance, long service life, can withstand strong pressure without breaking. Ideal for long-term use. Convenient design: Space-saving, 360-degree rotation, the release rings adopt an elliptical design for easy removal. No additional sealing is required; a simple press is all it takes to ensure a secure connection. Application: It is widely used in automated production equipment in industries such as machinery, electronics, automotive, and packaging. What you get: 40 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 various needs.