The 500-018 is a master network maintenance tool Kit in a carrying zipper bag. The kit comes with a variety of tools that you'll need to get almost any job done. some of the tools include an RJ-45 and RJ-11 Die set, 3/16" 1/4" 5/16" 11/32" 3/8" and 7/16" Nut Blades, T6 T7 T8 T9 Driver blades, and that's just to name a few! For your conveinience, the tools come in a stylish and well organized carry case.