Twelve black PP bins clip onto 3 included steel rails to give screws, nuts, bolts, and other small hardware a mounted home instead of a messy drawer. Each bin is 5.4 x 4.1 x 3 inches, small enough for a pegboard or wall above a workbench, yet the same bins also stack or sit flat on a shelf if you'd rather not mount them. The cold-rolled steel rails keep the row of bins locked in place without sagging, and the front-open bin shape lets you pull out a part with one hand instead of unhooking the whole bin. Label stickers are included for tagging contents, and the complete organizer weighs 4.6 pounds, so mounting it on drywall or a pegboard is straightforward. Odorless, rust-resistant PP plastic construction means the bins wipe clean and won't corrode, making this organizer a fit for garages, workshops, and craft rooms as well as kitchens and laundry areas.