Cast iron base adds 2 lbs. of stabilizing mass. Wide-based and rigid, The Rock helps eliminate the human factor in shooting. Features a 1" diameter steel center post with large elevation wheel, for quick height adjustments from 4 1/2" to 7 1/4". Three leveling feet make set-up quick, and an adjustable forend stop helps ensure shot-to-shot repeatability, plus a bubble level mounted on the cradle. The wide cradle accepts a variety of bags (not included) to accommodate most stock configurations.