This modular spacing rule is designed for standard brick. The popular red end brick rule means quality. The rule extends its 12 legs out to a complete 72 In.. Modular spacing with six scales are marked on one side of the rule. The other side is marked in feet, inches, eighths, and sixteenths. Each joint begins on an even number. The first section of the rule is shorter than the rest to allow for butting the rule on the first 16 In. module. Made from thick hardwood for long wear. Each leg is squared to fit perfectly in corners. Remember to keep your rule working well keep the joints oiled.