In a series of precision machined index holes engaging to a close tolerance, spring loaded index pins. The pin snaps into place, giving you confidence that it is precisely positioned. Even the most experienced carpenters face the challenge of accurately placing angles on large panel projects. You can try to extend the line from a small ratio, but even a small err will cause the line to stretch the larger the err. Our new precision rulers offer unrivaled precision for your signage layout work. Simply press the head to the desired angle and press straight down. The head is adjustable from 0 to 70 and locks securely every 5 (plus 22-1/2 and 67-1/2), giving you a precise reference angle and length, respectively. it is 10 inches Even if you are not using Angular, it is a layout tool that can be used in almost any project. The blades feature the same exclusive serration. Design flaws are found in our new products. Precision stainless steel square.