This 2" Deck Installation Anchor Bolt is used to attach One-Meter and Three-Meter Main Supports and Short Stand Fulcrum Boxes & Anchor Fittings to Hilti Inserts or Bronze Anchors. It is compatible with a 3/4″ Deck Installation Washer – SF138 & a 5/8″ Deck Installation Washer – SF139. Washers should be stacked and one of each size is required per mounting location.