You don't need to purchase LED mounting rings separately. This set includes 20 plastic LED mounting rings to help you complete your project more easily. Super bright with a luminous intensity of 6000-8000 mcd, simply connect to 12 V for excellent performance. Easy to use—just connect the positive and negative wires to your battery or power supply. Features low power consumption, stable performance, and long service life. Ideal for DIY projects, hobby lighting, boats, cars, industrial applications, cameras, toys, and costume design. Highly recommended for hobbyists. Specifications: LEDs with 20 cm cable, DC 12 V Color: As shown Diameter: 3 mm Opening angle: 25 degrees Cable length: 20 cm Operating temperature: -25 to 85°C Operating voltage: 5–12 V DC Current consumption: 5–25 mA Brightness: 10000–12000 mcd Wavelength: 3000–3500 nm Service life: Approximately 100,000 hours