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Lineman’s Insulating 4-in-1 Box Wrench. The Klein Tools Lineman’s Insulating 4-in-1 Box Wrench is the only double-ended 4-in-1 wrench on the market to meet the ASTM standard 1000V rating! It features a transparent handle that shows the metal ends of the wrench are not touching. The solid, durable wrench features four 12-point socket sizes: 1/2 Inch, 9/16 Inch, 5/8 Inch, and 3/4 Inch.