The temple is famous for the daily tattoos or Sak Yants given by the monks that live there, and especially for the tattoo festival held on the temple grounds once a year during March.
The Wai Khru ceremony is held for recharging the magical powers of the tattoo's. The animal spirits in the tattoo become alive....

Sak yant, also called yantra tattooing, is a form of sacred tattooing practiced in Southeast Asian countries including Cambodia and Thailand.

Sak yant are normally tattooed by Buddhist monks or Brahmin priests.

The Yantra designs that already existed in Hindu India were adapted by the Khmer as Buddhism arrived from neighbouring India. Records have shown that the tattoo dates back to Angkor times. Different masters have added to these designs through visions received in their meditations. Some Yant have been adapted from pre-Buddhist Shamanism and the belief in Animal Spirits that was to be found in the Southeast Asian sub-Continent and incorporated into the Thai Buddhist tradition.
The script used for Yant designs is ancient Khmer and Pali.

The tattoo is used for self-protection. People believe a yantra has magical powers that ward off evil and hardship. The tattoo is particularly popular amongst military personnel. The tattoo supposedly guarantees that the person cannot receive any physical harm as long as they follow certain conditions.