Our Milwaukee 7PC Metric HollowCore Magnetic Nut Driver set includes 5mm 5.5mm 6mm 7mm 8mm10mm and 13mm sizes. Our 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.