Abstract: A fence includes upright metal posts and a brace or rail clamped between the posts, where clamping the rail squares the posts with respect to the rail. The posts are anchored in the ground vertically, and the rail is installed horizontally, providing a rigid, H-shaped fence brace. Fence corners are provided by having at least three posts and two rails clamped together, although an additional post and rail can be used for added stability. Each rail preferably has a fixed, U-shaped clamp on each end, and a free, U-shaped clamp is bolted to the fixed clamp, the clamps encircling a fence post and squaring the fence post with respect to the rail. Gate hangers can be clamped to one of the posts to provide a gate post, where the gate hangers can be slid up or down or rotated about the post, providing flexibility for receiving and supporting a gate.