90-piece petal nut (jack nut) assortment kit with screws, in a plastic organizer case. Sizes: M4 x 20 (30 pcs), M5 x 25 (30 pcs), M6 x 25 (30 pcs). Zinc-plated carbon steel. The petals expand behind the panel to form a strong threaded anchor — great for hollow walls, thin sheet metal, license plates, panels, billboards and more. Brand: Yuetong Fasteners. Unused in the box; a few pieces may show light surface spots from storage (see photos). Pickup in Monterey Park or buyer pays shipping.