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 from dislodging during head turns Enhances 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!