Nkọwa ngwaahịa
Chuck – otu akụkụ rọba nke ngwa igwe na-ere ere.The dị chuck elu dayameta bụ φ32mm, φ45mm, φ56mm, φ57.6mm, wdg The dayameta nke mmiri ígwè waya nwere ike ịbụ φ3, φ4, φ5, na Chuck nwekwara ike ahaziri dị ka ndị ahịa chọrọ.