The most advanced miniaturized screwdriver system known to man, and it was designed with the quilter in mind. This miniature screwdriver fits all makes and models of sewing machines and due to the Neodymium rare earth magnet it is computer and LCD screen safe. Never drop a screw again. Assortment includes 18 prepackaged sets of two in display container. A single Screw B Do kit contains two slotted flat miniature screwdrivers, 14" and 316".