Drop-In Anchors
Drop-ins are internally threaded to accept a machine bolt and sit flush with the surface. They are intended for concrete, although they can be used in some thicker stone materials. They require the use of a special setting tool that expands the anchor in the hole. Even relatively short drop-in anchors have high pullout and shear resistance, but they are best in dense base materials. Just like a lag shield, a drop-in anchor should fit snugly in a hole that is slightly larger than the machine bolt it's designed for. Hole depth is critical.
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