The leveling base 60mm inner diameter, for most tripod heads, and includes external Spirits Leveling for easy and accurate between the tripod and head for both amateur and professional photographers, this accessory for anyone lookings to enhances their Shootings stability and Precisions Enhances your photography gear with tripod accessory, ensuring every shot leveled and stable, making it essential addition to any photographer toolkit from aerospace grade aluminum alloy, this tripod leveling base features Precisions machining and militarys anodized finish, ensuring durability and corrosions resistance for outdoor photography enthusiasts for outdoor landscape photography, and architectural projects, this tripod leveling base provide a straightforward and intuitives way to achieve horizontal alignment