This handy 13.5" w x 13.5" h x 4.75" d polystyrene storage case is perfect for construction sites. The center holds one 3-ring binder in a rugged weather-resistant and lockable case (note: to keep your SDS's "readily accessible" the case should not be locked during a workshift unless all employees have a key). This unit can sit on a table top or be wall-mounted. Binder not included. but the 01170 or 01172 binder is a good choice.