Type C (or Europlug) is a two-wire plug that has two round pins. It fits into any socket that accepts 4.0 – 4.8 mm round contacts on 19 mm centres.
Type F (also known as a Schuko plug) has two 4.8 mm round pins spaced 19 mm apart.
Type L has two variations: The 10 amp version has two round pins that are 4mm thick and spaced 5.5 mm apart, with a grounding pin in the middle. The 16 amp version has two round pins that are 5 mm thick, spaced 8mm apart, as well as a grounding pin.