An implant is described for anterior insertion in the spine. The implant includes a body and a cover, which house one or two blades attached to a blade actuating component. Each blade engages a corresponding channel in the blade actuating component. The blade or blades are extended or retracted when the blade actuating component is driven proximally inward or distally outward. Each blade is reinforced by a bridge portion formed along the distal facing side of the blade.