Check the listing for details. Malco Tools RRW316C Hex Key Ratchet Wrench Insert, 3/16". Condition: New. Listed at 11.99 USD. Malco Tools RRW316C Hex Key Ratchet Wrench Insert, 3/16"For installing or servicing heating, air conditioning or refrigeration units.5/16″ & 3/16″ Hex Key Wrench Inserts (optional) 1/4″ square drive shanks fit any Malco Refrigeration Ratchet Wrenches. Facilitates easy ratcheting action for servicing hard to access valves common in air condition and refrigeration condensing units. Fits most units with combination of RRW316, 3/4″ Tip Hex Key Wrench Insert and RRW316C, 1/2″ Tip Hex Key Wrench Insert.The RRW316C Hex Insert has a shorter 3/16 inch hex point which makes the 5/16 inch hex body also accessible as a hex key for many valve applications. Key inserts fit any Malco Refrigeration WrenchEasy ratcheting action when servicing hard to access valvesSquare Shank Dia. in.: 1/4Tip Length in.: 1/2 Hex Key Diameter in.: 3/16Overall Length in.: 2-3/16