Stackable and sturdy, these Medium Locking Storage Bins with Lids are a classroom essential. Featuring easy to open, durable locking clasps, these are great for keeping all of your supplies organized. Separate math manipulatives, art essentials and teacher supplies of any sort into these sturdy bins, then stack and store in your classroom centers. Shop our site to stock up on additional sizes in this style. Plastic. (3 pcs. per unit) 9 1/2" x 7" x 5 1/2"