vw98133: I don't know it is just me or not that an Arca-Swiss Style Lens plate has to come with a D-ring screw. Without a D-ring, a tool is required to either mount and dismount a plate. Most of those expensive ballheads don't have a D-ring screw.
Plates are not included with most A-S style head. Most people use custom plates that install permanently on the cameras and lenses.