When it comes to professional-grade tools, you can never go wrong with Knipex. This 8-piece set of open end wrenches from the 98 99 13 S4 series is a must-have for your toolbox. The head sizes range from 1/4 in. to 3/4 in., while the wrench head thickness ranges between 29/64 in and 21/32 in. This 8 pc. set includes both open end wrenches and box wrenches, making it a versatile choice for a variety of applications. Each wrench features chrome finish and insulated handles that protect against accidental contact with live electrical circuits or equipment during use, as well as offering insulation against heat build up when working on hot surfaces such as engine components. For those who want only the best for their jobs, this Knipex 98 99 13 S4 Insulated Open End Wrench Set is the ideal choice.