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Genuine Contour® Curve-O-Mark® 164GG Wrap-A-Round® is an inexpensive tool for marking straight lines on 3" to 6" O.D. pipe.
Contour® Curve-O-Mark® #6 Standard Centering Head is used on pipe 1/2" O.D. and larger.
The Contour® #1 Marker is an excellent all-around tool for laying out pipe and structural steel members up to 18 inches.