Thimble. Metal ring, with concave side into which a rope may be spliced, or seized; thimble can then take shackle pin, hook, or rope without chafing rope into which thimble is fitted. Made in various shapes. Usually of galvanised iron, steel, brass, or gunmetal.
Thimble Eye.Round hole, in steel or iron plate, with edge rounded or built up so that a rope can be rove through it instead of through a sheave.