Designed to fit the Arca p0 Ball Head, the DDY-60p0 Discal Clamp from Sunwayfoto features 3.7 oz lightweight aluminum fabrication, integrated bubble level and a calibration scale on its Arca-type compatible receiver. Safety grooves inside the receiver prevent inadvertent release while Sunwayphoto has also thoughtfully extended the knurled, quick-turn, tightening/locking handle to provide extra room to work with wide cameras. The clamp's corrosion-resistant finish neatly matches the Arca head it was designed for.