4" ID x 4.584" H 2" detachable collar. Mold volume of 1/30 cu. ft., cold-rolled steel tubing, plated for rust resistance. Includes detachable base plate, studs and wing nuts. Mold has vertical split in body with 2 quick-acting clamps for easy removal of specimen. ASTM D558, D698, D1557, AASHTO T99, T134, T180. Shipping wt. 17 lbs. (7.7kg)