The Leofoto YB-100P Series Leveling Base are designed to help users level a tripod 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 a 3/8" mounting stud. The handle twists to lock the base in place for ease of use when mounted with three different handle length options available. 3/8" Mounting Stud Precision Scale for Positioning Diameter: 100mm (Compatible with 100mm Bowl Tripods) Bubble Level Adjustment Range of +/- 15Adeg *Not compatible with 75mm bowl tripods YB-100LP (Long Handle): Base diameter: 100mm/ 3.93inLength: 136mm/ 5.35inWeight: 400g/ 0.88lb YB-100MP (Medium Handle): Base diameter: 100mm/ 3.93inLength: 100mm/ 3.93inWeight: 362g/ 0.79lb YB-100SP (Short Handle): Base diameter: 100mm/ 3.93inLength: 100mm/ 3.93inWeight: 245g/ 0.54lb