'The Jackson Safety Universal Level (#33) is a must-have multipurpose tool, featuring a 360-degree adjustable protractor dial bubble (DSL). The level has two cast-in 25-pound magnets (exerting a 50-pound pull) to securely hold the unit in place on any steel surface, including the underside of a pipe or beam. This permits hands-free leveling, even in tight spots. The bubble is mounted on a protractor dial, so it can be used in any position and still read accurately. Both faces of the level have deep, cast-in grooves for self-centering on the contour of the pipe and because the magnets are cast-in, they wonâ€t interfere with the use of the level on nonmagnetic materials (aluminum, copper, lumber, stone and others). For aligning pipe flanges (two-holing), the Universal Level comes with a two-threaded, self-aligning conical spacer and conical nut and bolt units. They are designed to fit any size bolt hold spaced between 2.25†and 8†centers on flanges, allowing the orientation of flange bolt holes for any size pipe.'