Gepe 453502 5-Compartment Storage Box with Lid for 3mm Thick Slide Mounts, Grey 5-Compartment Storage Box for 35mm Slide mounts Holds 55- 3mm thick slide mounts (Cat# 452004), 75- 2.3mm thick slide mounts (Cat#456002), or 90- 2mm slide mounts (Cat# 457001) Lid included