Masonry Anchor, Tapping Screw, Driling Screw manufacturer / supplier in China, offering Drop-in Anchor, 1/2"-13 Inner Female Thread Expansion Anchor, Zinc Plated Surface Drop in Anchors for Solid Concrete, 3/8 Inch Drop in Anchors M10 Zinc Plated Carbon Steel Concrete Knurled Internal Forced Expansion Screw Bolts for Home and Construction, Drop-in Anchors 5/8"-11 Zinc-Plated for Concrete, Secure Mounting, Industrial-Strength, Easy Installation - Perfect for Home, Construction,and Outdoor Applicate and so on.