These are used when it is necessary to insert something in them; for example, the eye of the hook of a common stropped block is put in the thimble before the strop is made and the thimble seized into position.
Ezi zisetyenziswa xa kunyanzelekile kufakwa into kuyo; umzekelo, intunja yesihakishi sebloko yethwathwa eliqhelekileyo sibekwa kwintwana phambi kwethwathwa, yenziwe nentwana yothimbo endaweni.