Indoor Outdoors 4 x Large Corner Brackets for Raised Beds, Bedding Vegetable Planet Box Garden - Square or Rectangular Planter or Bed Fixing Bracket - Black

This is a great product - I used it for raised bedding at the allotment. The brackets are really sturdy and hold the planks of wood really tightly together, but be aware that these are only designed for scaffolding planks and not other sizes of wood. It's not too difficult to assemble and looks great when complete. I've had jealous looks from my allotment plot holder neighbours already!

Used to create an allotment raised bed.

These were not cheap when delivery is accounted for and not to have screws included is disappointing otherwise they are sturdy enough.