I was actually hoping it would connect to another similar tool kit but it doesn't. It's also a little shallow (ironic), so you might find bulky tools getting in the way of closing the lid. For example, it fits in my cordless screwdriver but doesn't leave room for the bit case and charger, which fit in my free deep padded pouch that came with the screwdriver. However, it's much prettier and more organizationally functional with dividers and small pockets for screwdrivers and parts. The STST19900 product is good with the extra organizer.
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