YOU ARE PURCHASING TWELVE 100 Yard CONCRETE VOLUME ESTIMATOR CALCULATOR SLIDE RULE.

THIS WILL CALCULATE/ESTIMATE THE CONCRETE YARDS REQUIRED TO FILL AN AREA.

Used to calculate concrete yardage required for cylinders, piers, circular and rectangular slabs.

Thanks.

unit measures 7" long by 1-1/2" wide.

Unit is made of heavy duty plastic.

Easy instructions are printed directly on the slide rule.

THESE ARE MADE IN USA!!!!  REALLY!!!!!!

Great Christmas or Birthday gift for a Masonry Contractor!!!