The Fix It Sticks Universal Choke Tube Bit is a custom bit designed to remove and install the most common choke tubes while at the range or in the field. The bit is designed to work with most common choke tubes (from .410 to 10 gauge). Solid steel construction with a hex base that allows it to work with any magnetic 1/4" driver.NoteIntegrates perfectly with Fix It Sticks Replaceable Edition and T-Way Wrench for field / travel use.