M710-100 The Drainrack™ is sold separately for the SlideFile Storage System. It can hold up to 200 microscope slides in 100 individual numbered slots. All slides are stored upright for easier insertion and removal. Simply tilt them forward and backward with one finger to easily and rapidly pick up the slide you need. A unique feature with the DrainRack™ is to be able to read bar codes without having to remove the slides from the box. 10 Per Case.