DBI/Sala 2104560 Concrete D-Ring Anchor, Gray A simple, versatile and safe concrete anchor solution-for use in temporary or even permanent applications Reusable D-ring assembly, just install a new bolt and its ready to use again Rugged design for harsh environments with no moving or fragile parts to foul-up Safe "hook-up" indicator notifies the user the anchor has been installed properly For flexibility, install into 11/16-Inch or 3/4-Inch holes-only standard drill bits needed