6" ID x 4.584" H with 2" detachable collar. Mold volume of 1/13.33 cu. ft., cold-rolled steel tubing, plated for rust resistance. Steel base plate is 8" x 8" x 1/2" thick. ASTM D698, D1557, AASHTO T99, T180, Shipping wt. 15 lbs. (6.8kg)