Our 7-IN-1 HOLLOWCORE™ Multi-Nut Driver features a HOLLOWCORE™ shaft, which delivers unlimited depth in threaded rod and long bolt applications. This multi-nut driver includes 1/4”, 5/16”, 3/8”, 7/16”, 1/2”, 9/16”, & 3/4” HOLLOWCORE™ nut drivers for maximum versatility. The color-coded markings allow for quick size identification, and the wrench-ready shank provides additional leverage for tougher applications. MILWAUKEE® 7-IN-1 HOLLOWCORE™ Multi-Nut Driver is backed by a limited lifetime warranty.