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The tamping rod is a round, straight steel rod used with concrete cylinder molds, slump cones, and unit weight tests. Measures 5/8" diameter by 24" length. Both ends are rounded to a hemispherical tip. The tamping rod is plated for rust resistance and has a 6" scale in 1/4" increments engraved on end of the rod for measuring the slump.
The Cat# TR375 is a 3/8" diameter by 12" length, rounded hemispherical tips, less scale. Used primarily on 4" test cylinders. Meets ASTM C138. Does not have scale.