Precisely engineered / exact Arca Standard.Square base mounts in both axis's allowing 90° re-mounting of camera. Precision CNC machined from solid aircraft-grade aluminum.Ideal for compact cameras. No Back stop. Ideal for Olympus E-5.Mounting hole: 1/4-20″. Width: 40mm. Weight: 30g.Length 45mm.All metal construction.Includes 2 allen wrenches and 1/4" hex screw& 2 safety stop hex screws.