They are marked bv lines of growth and extremely tine, microscopic, closely placed, wavy, spiral striations.
en.wikipedia.org A forward-facing intermediate tine breaks the line to the top, which is usually forked.
en.wikipedia.org There are four general types of harrows: disc harrow, tine harrow, chain harrow and chain disk harrows.
en.wikipedia.org These are the main shaft, flattened center, first tine, second tine, third tine, fourth tine, and fifth or higher tines, respectively.
en.wikipedia.org To ease insertion into a hole the longer tine may be slightly curved to overlap the tip of the shorter tine or it is beveled.
en.wikipedia.org