Abstract: A corner protector, frame fender used to protect, during shipment or moving, a frame, piece of glass or any other generally rectangular object, comprising a relatively square, flat base of corrugated cardboard or paperboard which has a plurality of pre-scored, spaced lines along one diagonal, and is pre-cut along the other diagonal from the corners to the outside scored lines, able to be folded into one of a plurality of possible thicknesses, to fit the corners of the object to be protected.