Simpson Strong Tie DIA37 Simpson Strong-Tie Carbon Steel Drop-In Anchor 3/8-inch Rod 1-1/2-inch body 50 per Box

Drop-in anchors are internally threaded, deformation-controlled expansion anchors with a preassembled expander plug, suitable for flush mount applications in solid base materials. The anchor is set by driving the expansion plug towards the bottom of the anchor using the setting tool. Drop-in anchors are also available in coil-threaded versions for 1/2-inch and 3/4-inch coil threaded rod.