Features: Brand 360-degree swivel scuba diving regulator adapter with steel ball Made of chrome-plated marine-grade brass, durable and corrosion resistant Helps prevent second stage regulator from being pulled out of mouth during head turns Increases comfort when using the second stage regulator Length: Approx. 5.5 cm (2.2 inches); Diameter: Approx. 1.4 cm (0.6 inches) Material: Chrome-plated copper Color: As shown in picture Type options: SA11, SA12, or SA14 SA11 Size: Approx. 49 x 36 mm (1.92 x 1.41 inches) SA12 Size: Approx. 46 x 22 mm (1.81 x 0.86 inches) SA14 Size: Approx. 52 x 34 mm (2.04 x 1.33 inches) Package includes: 1 x Scuba Diving Regulator Adapter Note: Please allow 1-3 mm error due to manual measurement. Ensure you are comfortable with this before purchasing. Due to differences in monitor displays, the actual color may vary slightly from the image. Thank you!