When you need to access liquid and suction based valves, the JB Industries SAE Adapter Hex Key is the tool for the job. The heat-treated black oxide coating ensures it lasts long. With a hex adapter shape, this key can be used in different applications where there are liquid and suction based valves. It has a 3/16" tip size on one end and 5/16" tip size on the other end. The handle is an adapter type with a measurement type of SAE. This JB Industries Hex Key will make your work easier by saving time when accessing liquid and suction based valves.