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Why Is There A Black Diamond On A Tape Measure? [Solved]

The black diamonds which appear every 19 3/16” on metal tape measures are for spacing I-beam “timbers.” Several wood-product manufacturers offer I-beam “timbers” as a substitute for solid lumber floor joists. The diamond marks on tape rule blades are for spacing these engineered floor joists in new construction.

What the Black Diamond on Measuring Tapes Is Really Meant for and Secrets of Other Household Items

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Why are there black diamonds and red numbers on a tape measure?

Why are

What is the Black Diamond on a tape?

00:00 - What is the