Haoge HQR-350 350mm Multi-purpose Dual Dovetail Long Quick Release Extender Rail Sliding Plate for Camera Tripod Ballhead Clamp fit Benro Arca Swiss Sunwayfoto The Haoge HQR-350 universal quick release long plate is an Arca-type compatible multi-purpose rail with a laser-engraved reference scale with 1mm increments on both sides. It allowing for easy nodal point adjustments. Dual dovetail design with 350mm in Length, support two camera or flash at the same time. Compatible with a variety of digital cameras.