1 1/2 end, 1 1/2 side construction. Medium-duty for use with or without shelving. Quick set-up assembly. Deep, locking, lift-off lid stays in place for secure file storage. Rolled edges add strength and prevent paper cuts. Value Pack—Stock up and save! Box Type: Stackable File Storage; Box Style: Quick Set-Up; Strength: Medium-Duty; File Size Format: Letter/Legal.