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A #10 screw will be a close fit in the 10 hole and is approximately 3/16" in diameter. The tolerance on a #10 screw ranges from about 0.182" to 0.190". Gauges of this kind are not intended to make precise measurements, but to easily identify fasteners.


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If you are speaking of the holes marked 4,5,6,8,10, these are small bolt sizes. There is 1 size missing and that is #12. Most sizes with diameters less than 3/16" are listed as number sizes. I hope this helps and is what you are asking about.


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Remove (bust out) the glass block, install permanent support underneath (plywood patch supported either by blocking between joists, or fastened directly to the underside of the slab with concrete screws), notch the edges 1.5" wide by 1.5" deep, pour a cement mix patch with standard aggregate, make sure you get out air bubbles as you go (no voids), ...


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I happened upon this as I was shopping for a new rotary hammer bit. A couple of the posts here are correct. If you intend to construct a wall, the foundation component that will bear the load of such a wall will have to be designed to be up to the task. Furthermore, if you're tying into another concrete component -- like a footing or a reinforced concrete ...


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