The Tag Caddy is the best friend to your Sr. cattlevacbox. It can hold your tags/ tagger,use it to hold your bander and dehorner and if you implant it works great to hold your implants/ implant gun and your disinfectent! Easy to use, just slip on the side of the box, can be used on either side or both. Makes your cattlevacbox a complete vaccination station!! Comes separately or in the Sr. accessory package. Can be used on the Jr with the handle removed.