Component of the DASH complex; a microtubule-binding subcomplex of the outer kinetochore that is essential for proper chromosome segregation. The DASH complex mediates the formation and maintenance of bipolar kinetochore-microtubule attachments by forming closed rings around spindle microtubules and establishing interactions with proteins from the central kinetochore. May be necessary for growth under high osmotic stress. {ECO:0000269|PubMed:16079914}.