The Type C electrical plug adapter (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 centers. They are being replaced by E, F, J, K or N sockets which work perfectly with Type C plugs.
The Type E electrical plug has two 4.8 mm round pins spaced 19 mm apart and a hole for the socket's male earthing pin. The Type E plug has a rounded shape and the Type E socket has a round recess. Type E plugs are rated 16 amps.
The Type F electrical plug (also known as a Schuko plug) has two 4.8 mm round pins spaced 19 mm apart. It is similar to the Type E plug but has two earth clips on the side rather than a female earth contact. The CEE 7/7 plug was developed to work with sockets E and F and has grounding clips on both sides (to work with Type F sockets) and a female contact (to accept the grounding pin of the type E socket).