Isethi yezikhiye zesibambo esingu-T ezinosayizi ongu-2.5-8 mm nazo zombili isiphetho eside nesifushane esinokulingana okujwayelekile kwe-hexagon. Kuhlinzekwe ngethreyi ye-TC ye-Teng Tools eyingqayizivele enesivalo esikhiphekayo nomsila wejuba ukuze izisebenzise yona ngokwayo noma njengengxenye yohlelo lokulawula lwe-TC Amathuluzi e-Teng.