Red End® Modular Spacing Rulers
2 courses in 16" space (for concrete blocks and glass blocks)3 courses in 16" space (For facing tile)4 courses in 16" space ( for Roan brick). Scales include mortar space and spacing for 6" and 12" blocksAll sections have square endsEvery joint opens on even numberInside marked with 6 scales in a 16" module. The scales are as followsOutside is graduated on both edges to 1/16thsThe first end section is a short section which permits butting the rule on the first 16" module