Bolt Assembly, For Slot Width 8.2 mm, Steel, Zinc-Plated, Fastener Thread Size M8, Fastener Thread Length 20 mm, T-Nut, Socket Head Cap, Threaded Hole Location Single Offset, Slide-In, Metric, Compatible Brand and Series 80/20, 40 Series, Compatible Manufacturer Model Number 40-2130, 40-2140, 40-2420, 40 Series, Package Quantity 15 T-Slotted Extruded Aluminum Rail AccessoriesFor use in assembling machine guards and enclosures, workstations, displays, carts, shelving, and other fixtures.