The MILWAUKEE 7PC Metric HollowCore Nut Driver set includes 5mm, 5.5mm, 6mm, 7mm, 8mm,10mm, and 13mm sizes. These nut drivers feature a HOLLOWCORE Shaft, which delivers unlimited depth in threaded rod and long bolt applications. The color-coded markings allow for easy size identification and the wrench-ready steel shanks provide additional leverage for tougher applications. Milwaukee HOLLOWCORE Nut Drivers are backed by Milwaukee's Limited Lifetime Warranty.