General Tools Square Head Protractor is crafted from durable ground stainless steel, ensuring long-lasting performance and resistance to wear. This protractor features permanently etched graduations that measure from 0 to 180 degrees in opposite directions, providing precise angle readings. The protractor head measures 3-3/8 inches by 2 inches, while the adjustable arm extends up to 6 inches and can be securely locked in place with a knurled thumb nut for accurate positioning. Its overall dimensions are 3-3/4 inches wide by 12-1/2 inches long, making it a versatile and reliable tool for various measuring tasks. The product comes packaged individually on a card for easy handling and storage. Model Number: 17