This is a kit of 63 general purpose components for electricians, contained in a case manufactured by Knipex. The components in the kit include 00, 21, and 42 items, which can include various types of wiring supplies, components, fixtures, and related tools. The exact items may vary from kit to kit, but may include items such as screws, nuts, bolts, wirenuts, clamps, connectors, switches, and other electrical supplies.