Feature 1Perfect Compatibility: Suitable for the 9.5mm inner diameter and 12.7mm outer diameter thin tube. 2Easy Installation: Compact and flexible, easy to screw on and off. 3Made of brass material, durable and reliable. 4With hiding silicone ring, perfect for connection and seal. 5Delicate Workmanship: Chromium plating on the surface, high quality, durable and beautiful.Specification Features: Perfect Compatibility: Suitable for the 9.5mm inner diameter and 12.7mm outer diameter thin tube. Easy Installation: Compact and flexible, easy to screw on and off. Made of brass material, durable and reliable. With hiding silicone ring, perfect for connection and seal. Delicate Workmanship: Chromium plating on the surface, high quality, durable and beautiful. Specification: Material: Brass Color: Black, Silver (Optional) Surface Treatment: Chromium Plating Thread Type: 2'' G1/4 Outer Diameter: 12.9mm Applicable Tube: For 9.5mm inner diameter and 12.7mm outer diameter thin tube. Weight: 50g (2PCS) Size: Approx. 2.2 x 2.0 x 2.0cm / 0.86 x 0.79 x 0.79in Package list: 2 * Two-Touch Fitting Note: Please allow 0-2mm error due to manual measurement. Thanks to your understanding.