Central scaffolding component of the centrioles ensuring their 9-fold symmetry (By similarity). Required for centrosome biogenesis and duplication: required both for mother-centriole- dependent centriole duplication and deuterosome-dependent centriole amplification in multiciliated cells (PubMed:15665853, PubMed:16244668, PubMed:17681131). Not required for centriole formation in embryonic stem cells but necessary to maintain centriole architecture (By similarity). Required for the recruitment of STIL to the procentriole and for STIL-mediated centriole amplification (PubMed:22020124). Overexpression results in excess foci-bearing centriolar markers (PubMed:15665853). {ECO:0000250|UniProtKB:Q7ZVT3, ECO:0000250|UniProtKB:Q80UK7, ECO:0000269|PubMed:15665853, ECO:0000269|PubMed:16244668, ECO:0000269|PubMed:17681131, ECO:0000269|PubMed:22020124}. This is the function of Ensembl gene identifier ENSG00000156876 (SASS6, SAS-6 centriolar assembly protein).