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'', 9/16'', 5/8'', and 3/4''.