Involved in nucleotide excision repair of DNA damaged with UV light, bulky adducts, or cross-linking agents. Along with RAD1 forms an endonuclease that specifically degrades single-stranded DNA. Component of the nucleotide excision repair factor 1 (NEF1) complex consisting of RAD1, RAD10 and RAD14. Interacts with SAW1. Belongs to the ERCC1/RAD10/SWI10 family.