Easy bottoming with free fall, slow action with tension fall. A horizontal fall metal jig is suitable for inviting with fall action, which is the standard of Ajing, but the horizontal fall metal jig has poor bottoming performance. Therefore, in free fall, the center of gravity is designed to be forward for the purpose of increasing the fall speed of the metal jig underwater and improving the bottoming performance. In addition to the forward leaning center of gravity, assist hooks are attached to the front and back, so when lifting and falling after landing on the bottom, the horizontal posture is maintained by tension fall, producing a slow fall, which is the basic technique of Ajing.