Proposed to be part of the KMN network incorporating the MIS12 complex and NDC80 complex that is required for establishing the kinetochore-microtubule interface that aids in chromosome segregation during meiotic and mitotic cell division. Appears to function downstream of hcp-3 (CENP-A) and hcp-4 (CENP-C) in the kinetochore assembly hierarchy. Has a role in the correct localization of spdl-1 and the RZZ complex that is composed of rod-1; czw-1 and zwl-1 (By similarity). {ECO:0000250|UniProtKB:P34278}.