Jackson Safety Curv-o-mark #1 Standard Contour Marker & Structural Adapter - Compact - 1.5" to 18" Diameter - With Soapstone CrayonCONTOUR MARKER: Jackson Safety Curv-O-Mark's #1 Contour Marker is a compact, time-saving tool used to lay out pipe and structural steel jointsLESS WASTE, LESS HEADACHE: Eliminates complicated mathematical formulas, cut and try, and need less material wasteLAY OUT PIPES: Can be used to lay out pipe from 1-1/2 to 18 in diameter, or structural steel members up to 18 inches in a right side up or upside down positionPRECISE LAYOUT: Ideal for quick, precise layout of laterals at any angled, tees, wyes, crosses, elbows, any type or size of jointDESIGN: Consists of an x-shaped frame, calibrated protractor, and a triple-jointed marking arm and holder