Compact, time-saving tool used to lay out pipe and structural steel joints;Ideal for quick, precise layout of laterals at any angle, tees, wyes, crosses, elbows, any type or size of joint;Eliminates complicated mathematical formulas, cut and try, and need less material waste;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 position;Consists of an X-shaped frame, calibrated protractor, and a triple-jointed marking arm and holderJackson Safety 14771 Curv-O-Mark #1 Contour Marker