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Concrete Bolts Sleeve Anchors SIZE: The diameter of the anchor is 5/16". The length of the anchor is 2-1/2". Perfect for mounting to concrete or block. Sleeve type anchors feature a split expansion sleeve over a threaded stud bolt body and integral expander, nut and washer. Anchors are made of Plated Carbon Steel. Anchors should be installed with carbide tipped hammer drill bits or any other concrete drilling type bits. Anchor diameter equals hole diameter. Available in hex head styles. Provides full 360° hole contact over large area and reduces concrete stress. Heavy-loading capacity. Preassembled for faster, easier installations.Can be installed through object to be fastened. Sleeve design improves holding power. No pre-spotting of holes necessary. Welcome to our store. If there are any questions before and after purchase, please feel free to contact us, we will reply to you during 24hrs.