Risthaarne nurgik koosneb terasest teralehest, mis on kas keevitatud või kinnitatud raskema korpuse külge 90° nurga all ning tavaliselt on nurgiku sisenurgas väike sälk, mis hoiab ära väikeste osakeste kogunemise ristumiskohas.
A engineer's square consists of a steel blade inserted and either welded or pinned into a heavier body at an angle of 90°, and usually a small notch is present at the inside corner of the square. This prevents small particles from accumulating at the juncture.
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