IDEAL Precision Levels are designed for both conduit and regular level applications, providing some of the most accurate features in the industry. The entire chassis is CNC machined from 6067 aluminum billet for straightness. The 3.5" and 6" levels feature an integrated Thumb Winder? conduit wheel with a contoured schrew designed for non-slip grip and stability that prevents doglegs in complext conduit bends. IDEAL levels also contain corrosion resistant brass screws that allow for easy vial replacement, and the oversized neodynim rare earth magnets provide the highest magnetic field strength and stability.