This is a nicely made little PC cord which inserts into the Metz 'standard' SCA 301 adapter (catalog number MZ5519, B&H code "ME5519"), which itself can be used upon any of the SCA-system flashes with their interchangeable adapters.
It is perfect for use directly upon the flash shoe of a camera, with small brackets that don't require much range of motion, or whenever you want a minimum of mass.
If you need a longer cord which works with the same SCA 301 adapter, select the 36-52 PC Cord instead (catalog number MZ5534, B&H code "ME5534").