These specialty spindles and foam pieces keep your thread organized while also keeping your project threads separate from your general stash. While made for the RNK Storage Box, they can also be used for drawers in sewing cabinets and other organizers, as well as open use on sewing & crafting tables! Package includes 2 Spindle Inserts & 2 Foam Support Holders for use with the RNK Storage Box and similar sized organizers.