The giant stand beside the gate to protect the temple from all devil and ghost.
All Giants around Wat Phra Kaew was turn his face to The hall of Temple for protect The Emerald Buddha (Phra Kaew Morakot or Phra Bhuddha Maha Mani Ratana Patimakorn). All giants around was 12, come from The Ramayana scene (same story on Mural wall painting).