This specification informs about the shape of the needle tip
and its size as well as the shape of its assembly. It is customary to express
this value in thousandths of an inch. In tapered needles, sizes greater than
0.7 thousand should not be allowed, and between two tapered needles, the
smaller radio is better, as it will better read the walls of the furrow,
reducing the effect of the tap. Conical needles should not be greater than 0.3
thousand the radius smaller or greater than 0.7 thousand the largest.
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