3 adjectives to describe cleats

Then, catching hold of the tow rope, I jumped up myself, and made the dinghy fast to a convenient cleat.

" With the oars the two boys made a sort of arched framework, secured with ropes, and over it spread the canvas cockpit cover, lashing it down to the forward and side cleats.

They were all built of planks cut out of solid timber to the form required, dowelled together by wooden pegs, as a cooper fastens the head of a cask, and the whole afterwards strengthened by timbers, lashed with split rattan to solid cleats left for the purpose in each plank, during the process of hewing it into shape.

3 adjectives to describe  cleats