Klein Tools 56999 Conduit Locknut Wrench for 1/2-Inch and 3/4-Inch Connectors, Direct Drive Heads Rotate

Amazon.com Price: $41.10 (as of 06/05/2021 15:19 PST- Details)

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Unique design loosens or tightens connectors using a stationary twisting motion
Easily attach locknuts in tight or deep cut-in boxes