The Leofoto YB-100K Series Leveling Base w/ Arca-Type QR Clamp is designed to help users level a standard tripod or fluid head in order to maintain level horizons and reduce time-consuming post processing corrections. The leveling base features a lightweight aluminum construction and the base is topped by the widely used Arca-type clamp. The handle twists to lock the base in place for ease of use when mounted with three different handle length options available. Specifications: Base diameter: 100mm/ 3.93inLength: 148mm/ 5.82inWeight: 537g/ 1.18lb Leofoto 100mm Leveling Half-Ball Arca Compatible Adapter w/Clamp Knob Control YB-100LK