Our keystone style pallet racks feature upright frames engineered to promote the structural integrity of the racking system, columns with solid corners, and keystone slots punched in the area of least stress for maximum load capacity. Holes are punched on both sides and offset from the keystone connectors on the beams to prevent accidental dislodgement. Keystone slots and holes are punched in a single row on 3" centers, allowing the beams to adjust in 3" increments.