The Hillman Group 370823 Hex Head Sleeve Anchor, 1/4 X 1-3/8-Inch, 50-Pack Product Description Concrete Sleeve Anchors' design allows them to anchor into concrete, brick and block. Turning the nut pulls the working end of the sleeve anchor up through the sleeve, expanding and anchoring itself securely in the concrete, brick or block. From the Manufacturer Concrete Sleeve Anchors' design allows them to anchor into concrete, brick and block. Turning the nut pulls the working end of the sleeve anchor up through the sleeve, expanding and anchoring itself securely in the concrete, brick or block. Features Expansion type anchors used to fasten fixtures into a variety of base materials Versatile and ideal for concrete, or masonry Common applications include door and window frame installations, mounting fixtures on walls, shelving and storage Zinc-plating provides durability and moderate corrosion protection Pre-drilling required USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.