Component of the SKA1 complex, a microtubule-binding subcomplex of the outer kinetochore that is essential for proper chromosome segregation. The SKA1 complex is a direct component of the kinetochore-microtubule interface and directly associates with microtubules as oligomeric assemblies. The complex facilitates the processive movement of microspheres along a microtubule in a depolymerization-coupled manner. In the complex, it mediates the microtubule-stimulated oligomerization. Affinity for microtubules is synergistically enhanced in the presence of the ndc-80 complex and may allow the ndc-80 complex to track depolymerizing microtubules. Component of the SKA1 complex, composed of SKA1, SKA2 and SKA3. The core SKA1 complex is composed of 2 SKA1-SKA2 heterodimers, each heterodimer interacting with a molecule of the SKA3 homodimer. The core SKA1 complex associates with microtubules and forms oligomeric assemblies. Interacts with SKA1; the interaction is direct. Localizes to the outer kinetochore and spindle microtubules during mitosis in a NDC80 complex-dependent manner. Belongs to the SKA3 family.