Rockwood #460.ALM Commercial Kick Down Door Stop in Aluminum Finish. 4" Throw kicks down to hold door open. Solid Cast Aluminum body with DuraFlex Bumper. 4 Hole mounting. The replaceable DuraFlex bumper provides a reliable grip on the floor. Great for commercial applications. Base: 2-1/16" x 1-3/8" Projection: 4".