●STC FoGrip accessories Attach the L bracket to the foolgrip to hold the camera in a vertical position on a tripod or on a corresponding head ●Works with all STC FoGrip series ●Arca Swiss compatible with 1/4" screw holes ●There is also a hole to attach the strap ●Place the L-bracket protrusion into the fo-grip hole and tighten the included slotted screws to secure it securely