A chalk line is a case containing powdered chalk and reel of string. You use it to make long, straight lines on flat surfaces like walls. Mark the beginning and end locations of your line. Shake the chalk line to make sure that the chalk is covering the string. Fasten the end of the string at one mark. Stretch the string over the surface, but don't place it against the surface. Stretch taut and hold the string at your second marking. With your other hand, pull the string away from your surface and let go. (Snap the line.) Gently lift the string off of the surface and rewind it into the casing using the crank.
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