UV3XL - Target Kit Everything you love about the UV3 - Just Bigger! UV3XL has an inside diameter of 41mm. The UV3 has an inside diameter of 31mm. The new advanced light has 10 brightness levels, 5 individual LED's for optimal brightness, auto-off (after 4 minutes), allows you to light up your level, and is 100% waterproof. To light up your level, hold the power button for 2 seconds. The 5 LED brightly illuminates colored dots and fiber without the need for an up pin or big ugly battery packs with loose wires. Aircraft-grade aluminum housing, anodized to a beautiful grey finish. Mounts onto Axcel, Shibuya, Sure-Loc, B3, CBE, or any sight that accepts 10-32 threaded rods. Never run out of battery power again with over 6hrs of battery life at 80% brightness - takes two cr2025 batteries (can be found anywhere, common size). Easily swap from one lens cartridge to another depending on what discipline you are shooting. Includes: 1- Housing with a green level installed (aircraft-grade, anodized aluminum) 1- Lens Cartridge 1- UV3XL Light Kit 1- Dot Kit - with red, orange, yellow, and green dots. 1- 4" Fiber Kit - with red, blue, and green 0.019" fiber 1- 20", 0.019" green fiber Mounting Bolts & extra Set Screws Extra Batteries (2x cr2025) (get extra batteries