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3D3DConcrete float.
This is a tool used to smooth the surface of freshly-poured concrete. It forces the aggregate down, leaving a smooth surface of fines. The best of these tools are made of magnesium, because it's very light: After a few hours of smoothing concrete, you appreciate that in a float, especially the larger kind used on the end of very long poles to smooth large areas of wet concrete, which of course you have to smooth while standing off to the side.
Source: Hardware Store
Contributor: Theodore Gray
Acquired: 28 October, 2005
Price: $20
Size: 18"
Purity: 90%