The Work Sharp Precision Adjust Upgrade Kit includes 7 abrasive grits and a carry case for expanding your Precision Adjust Knife Sharpener system. The Upgrade Kit contains 2 Tri-Brasive assemblies, a leather strop, a ceramic serration sharpener, and a premium carry case. The coarse Tri-Brasive assembly includes 220, 320, and 400 grit diamond plates to quickly restore a sharp edge. The fine Tri-Brasive assembly includes 600, 800, grit diamond plates along with a fine ceramic stone to hone to an incredibly keen edge on any knife. The included leather strop refines and polishes your knife to a scary sharp edge. The ceramic rod on the back of the leather strop hones serrations. The included premium carry case keeps the system with all the abrasives organized and where you want them.