Acts like a ratchet wrench. So quick and easy to remove both A/F and Metric sizes. To tighten or loosen a nut or bolt you flip the teeth side to grab the pointed edge of the bolt or nut and make sure that the other side is flat against the flat side. Exert pressure in and up or down motion to tighten or loosen the bolt or nut. Can be used for a multitude of head shapes and sizes.