Carlson Sporting Clays 20 Gauge Speed Wrenches are the fastest tube wrenches on the market. Insert and remove your choke tubes in seconds with this awesome speed wrench. This is great for sporting clays when you have a limited amount of time in between rounds. Different stations have different sizes of targets and distances that can call for different chokes. These speed demons are easy to use with your thumb and index finger. Just tighten or loosen the black thumb knob on the wrench in order to insert or remove. These work great anywhere, including the field, on your bench, or in any other location.