The drop-in anchor is used in medium to heavy-duty applications in solid material such as concrete and stone. A flush, female anchor, the drop-in houses an internal plug which is held securely in place even when used in overhead applications. Using the setting tool provided with each 100 anchors, the plug is driven to exactly the right depth, causing the anchor to expand. Drop-ins are frequently used for over-head applications, including hanging pipe, duct work, machinery, etc.