Wannan rukunin yana kunshe da chuck da collet.Chuck ya shigar da na'urar diyya don farar zaren.Akwai tarin tarin famfo daban-daban guda biyu, ɗayan yana da kariya ta wuce gona da iri ɗaya kuma babu.Lokacin amfani da collet ɗin famfo tare da kariyar wuce gona da iri, na'urar kariyar na iya fitowa ta atomatik don gujewa hutun famfo. Kawai daidaita goro kuma zaku iya samun juzu'in sakin daban cikin sauri da dacewa.