Leofoto DC-12 is a screw knob micro arca swiss clamp with additional 2 x 1/4" mounting threads, which one of it has a male 1/4" screw. Great flexibility and lightweight. See pictures on application and video made by us.
Length: 66mm (include screw knob), 49mm without
Mounting hole: 1/4" x 2 (one has a 1/4" screw for male attachments)