Gray Tools’ MB12-I 12 Piece Metric Open End Wrench Set is perfect for tightening and loosening bolts. It contains sizes 8mm to 17mm. Each wrench features an orange top insulation layer, as well as a second yellow layer that also serves as a visual safety indicator. The set offers user protection for up to 1000 V. This product is tested to ASTM F1505 standards and individually insulated. Gray Tools’ MB12-I 12 Piece Metric Open End Wrench Set comes with everything you need to get the job done right.