Haoge LQR-180 180mm Multi-Purpose Dual Dovetail Long Quick Release Extender Rail Sliding Plate for Camera Tripod Ballhead Clamp fit Benro Arca Swiss Sunwayfoto The Haoge LQR-180 universal dual dovetail quick release long plate is an Arca-type compatible multi-purpose rail with a laser-engraved reference scale with 2mm increments on both sides. It allowing for easy nodal point adjustments. Dual dovetail design with 180mm in Length Compatible with a variety of digital cameras.