The 3 Legged Thing QR4 Release Plate is designed for ultimate
functionality, combining a standard 38mm Arca Swiss compatible base,
with the patented Peak Design Capture Shoe. QR4 sits tight to your
camera without any movement or drift, and features two security screws,
which, if removed enables the QR4 to slot beautifully into any Peak
Design Capture device. With milled stainless steel camera screw, the QR4
is secure and strong.