How to Keep Gravel in Place on Driveways and Walkways
There is also quarry item # 4, or crushed limestone, gray item # 4 which appears dark grey in color, and crushed bluestone item #4. Crushed bluestone item #4 is usually found in municipal driveways, though. The middle layer of a gravel driveway features stones closer to golf ball size, with #57 stone being the prominent type of gravel.
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