These Table Top Fasteners provide a sturdy connection between the tabletop and apron, while still allowing the top to expand and contract with seasonal humidity changes. This prevents cracks from forming over time. The table clips slip neatly into a groove in the apron and attach to the tabletop with a single screw-simple, efficient and strong. Heavy gauge steel ensures a sturdy connection.Technical Details: Table top clips are made of extra heavy #A gauge cold rolled steel with a bright steel finish.Screws are included.Each tabletop fastener measures 5/8" width x 1-1/4" length.Tabletop fasteners are screwed to underside of table and hook into a 3/32" slot on the apron, which allows for expansion and contraction of tabletop. All Rockler products come in Rockler branded packaging. Product received in generic packaging should be reported to Amazon as a knockoff.