The Milwaukee Folding Rule Offers Maximum Durability By Featuring Composite Laminated Blades For Water and Scratch Resistance. Heat Stamped Markings Resist Wear and Abrasion For Tough Jobsite Conditions. Corrosion-Free Embedded Joints Also Lock At 0°, 90° and 180° For Added Utility and Durability. Patent-Pending Reference Angle Markings Allows Users to Quickly Determine Common Conduit Bend Angles.