Measures Accurately - The Base is cut out on one side, adjacent to the rule, permitting easier readings and more accurate measurements. The 6" hook rule permits easier readings from the edge of a workplace to the edges of the slots, and shoulders. Safe and Smooth Adjustment - The Gage can be smoothly adjusted to the required measurement and then locked into position by a knurled nut. Rules are either 610N (6 inch) or 635N (150mm) models. Best Performance - These gages consists of a nicely finished, hardened steel head and an accurate, machine divided, tempered steel rule. Great Value for Money - It is designed with high-quality materials to meet the highest standards of professional performance, making it a great choice for anyone looking to get the best value for their money. A Brand You Can Rely On - Starrett tools have been the go-to choice of professionals and do-it yourselfers for over 100 years. With a legacy of quality and innovation, these tools are essential for any workshop. The Starrett Rule Depth Gage has an excellent service life and outstanding work performance. The Base is cut out on one side, adjacent to the rule, permitting easier readings and more accurate measurements. The 6" hook rule permits easier readings from the edge of a workplace to the edges of the slots, and shoulders. The Gage can be smoothly adjusted to the required measurement and then locked into position by a knurled nut. Rules are either 610N (6 inch) or 635N (150mm) models. These gages consists of a nicely finished, hardened steel head and an accurate, machine divided, tempered steel rule. Whether you're an experienced professional or an amateur when it comes to home improvement, our tools are handy and accessible. Starrett has set the standard for precision, quality, and innovation. Our products are long-lasting and robust with excellent service and performance. Manufacturing long-lasting and easy to use tools that provide consistent and reliable performance since 1880, Starrett tools are made with the highest standard of quality and workmanship, manufacturing more than 5,000 various tools, gages, and instruments, providing fine precision tools for industrial, professional, and consumer markets worldwide.