This steel rule by Starrett is an essential tool for measuring and layout tasks. With a length of 6 inches and 4R graduation, it is accurate and precise. The rule is made of spring-tempered steel, making it durable and long-lasting. It is suitable for use in workshops and home projects. The Starrett C604R-6 steel rule is ideal for measuring tapes and rulers. It belongs to the category of measuring and layout tools and can be used in various applications. It is a reliable and efficient tool that is perfect for anyone who needs an accurate measurement.