The Allen Competitor Crank Style Choke Tube Wrench is designed for 12 Gauge Shotguns. The Thumb screw adjustment makes a tight fit possible for removing stubborn choke tubes. The crank handle provides extra torque and comfort. The compact size makes storage easy. For 12 Gauge only. Made from Aluminum, Steel and plastic. FeaturesEasy to use, adjust just onceCrank handle is easy on fingersAdjustable tube diameterSoft rubber choke tube gripper12 Gauge only