Klein Tools 86939 Hex Adapter for 1/4-Inch Square to 3/16 and 5/16-Inch Hex for Refrigeration Wrench, Made in USA, HVAC&R

Hex Key provides access to 3/16-Inch and 5/16-Inch hard to reach valves, Adapter fits 1/4-Inch square wrench opening, Spring loaded ball bearing locks securely into wrench, Fits with Klein Refrigeration Wrenches 86938 and 68310 for easy ratcheting action, Made in USA, Perfect for heating, AC, and refrigeration applications, Black oxide coating