SUNWAYFOTO brand Arca-Swiss compatible Wide Base Universal L Plate DPL-04 DPL04 Sunway SUNWAYFOTO brand Arca-Swiss compatible Precisely engineered / exact Arca Standard: 39mm Dovetail change from landscape to portrait mode without adjusting your setup All metal construction Removable/ adjustable backstop. Backstop can be mounted in 3 positions on either side of the rail.