The economical way to buy American PRO® Ball-Bearing quality tool chests. Supplied packed one inside the other. This mid-size combo has smooth 25mm ball-bearing slides and all the features of the professional chests, except that the rollcab is not lockable and the castors are Ø75mm. These boxes are not interchangeable with the rest of the American PRO® Ball-Bearing Range (except for the AP22309BB range of mid-boxes).