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Contact SupplierWelfast Drop-In Anchors are internally threaded anchors for bolts and threaded rods. These are zinc plated steel tubular expansion shield and a solid, cone-shaped expander plug. The shield has four equally placed slots for a portion of its length and the bottom part may be knurled. The shield also has a smooth, flangeless top that allows for either flush or countersunk installation. The bottom lip of the shield is tapered to allow maximum depth and holding power.