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types of screw heads Secrets

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A slotted or flat travel screw head requires a flat blade or slotted screwdriver or little bit to tighten or loosen. They are made having a slotted flat line through the head to allow a flat blade to tighten/loosen this https://izaakvxkk556514.idblogz.com/28895899/the-best-side-of-types-of-screw-heads

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