Need more storage space for your loose and small items? These durable plastic bins fit securely atop all Kargo Master Shelving Units to create additional organized storage spaces that would've otherwise been wasted. These plastic bins are custom fitted to stay securely in place to prevent any displacement even on a bumpy road. If you have a 42" shelving, with a drawer cabinet and considering using bins, you may want to consider adding this organizer to have extra storage space for your loose parts.