Planing a square edge on a board requires a jointer fence, whether you are using an electric jointer or a hand plane.
The Veritas jointer fence allows you to shoot accurate and consistent square or bevelled edges with most* iron or steel bench planes. The integral rare-earth magnets make it quick and easy to attach or remove the 279mm long anodized aluminum fence from either side of all sizes of bench planes, from a smooth plane (#4) to a jointer (#8).
As supplied, the 50.8mm tall guiding face can be used to plane edges perfectly square to the face of your workpiece. It can also be used to shoot angles less than 90° when a bevelled wooden guide is attached to the inside face of the fence.