... :ZP,HDGalvanised Standard: DIN ANSI JISDrop in anchorApplication:Overhead hangers with threaded rod ,Handrails ,Shelving ,Light fixtures ,Machinery ,Flat steel, steel ... the anchor to expand.Drop-in anchor will work with bolts or threaded rods of any length. Drill holes same length ... concrete. If anchor is no longer needed, can fill with cement to make the surface smooth again.Heavy Duty AnchorsLength ...