TOPTICON bubble level is designed to optimize the shooting experience. Its compact exterior design occupies just one Picatinny rail slot, maximizing space efficiency on your firearm setup. The low-profile open design ensures easy-to-read precision, allowing for quick and accurate leveling of your firearm. Constructed from high-quality 6061 aluminum and treated with a hard anodized finish, our bubble level guarantees stability and reliability whether you're at the shooting range or out in the field. The anti-cant level bubbles effectively counter scope cant error, which can cause horizontal drift in your shots. With this feature, you can easily confirm the proper alignment of your rifle before each shot, ensuring maximum accuracy. TOPTICON Level Bubble Products are designed to effortlessly verify the vertical alignment of your rifle, enhancing your shooting precision and reliability.