Our Milwaukee SAE HollowCore 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.HollowCore shaft for maximum versatilityWrench-ready shaftChrome plated for rust protectionRemoves rusted and stripped boltsComfortable tri-lobe handleEasy identification color coded markingMagnetic drivers – secure fitment in fastening applicationsHollow shaft for multi-length threaded rod applicationsForged steel shanks provide longer life and more durability