Package includes 2 premium knurled drop in anchorsFor use with 5/8-11 bolt2-1/2" hole depth and 7/8" hole diameterIdeal for solid concreteZinc CR+3 plated RoHS compliantDrop in anchors are used for anchoring into solid concrete. As the the bolt is tightened, the sleeve dilates against the substrate. Drop-in anchors are made of zinc plated steel for long lasting durability and dependability. Anchors are designed to secure material or structures to concrete. Fasteners accommodate handrails, lighting fixtures, piping, and more.