Think of any kind of construction or assembly project you've ever been involved in, and think of how much of it was based on straight lines. The fact is that a straight line is the basis of almost everything we build or put together. Without a perfectly straight line, pieces wouldn't fit and things wouldn't stay together. In order to assure you're working off of and creating perfectly straight lines, invest in a quality Straight Rule from Tools-Plus. These Straight Rules are designed to be durable, lightweight and most of all, highly accurate. Possibly one of the simplest and most essential tools you'll ever own.