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Little Known Facts About types of screw heads.

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To paraphrase, 3 Robertson squares are superimposed in a successive 30° rotation. The design is similar to that from the double-sq., in both of those scenarios The concept being that it resembles a square (Robertson) https://honeysrym467026.buyoutblog.com/28193595/how-types-of-screw-heads-can-save-you-time-stress-and-money

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