The 14" Left Wood Shelf Bracket has three teeth that fit into universal line slotting for a secure hold. This wood shelf bracket will fit all president line slotted standards (surface mount or recessed) that have 0.5" slots on 1" centers for either medium weight thickness (0.06") or heavyweight thickness (0.09"). Use this bracket in the center or along the interior underside; it is not intended for use at shelf ends.