National Hardware N324-186 MPB238 Kickdown Door Stop in Satin Chrome Used to prevent damage to the wall The stop locks in the up position toallow the door to open freely The ribbed rubber foot is for positive holding Spring design holds the stop in the up position Die cast zinc body Die cast zinc body The ribbed rubber foot is for positive holding Spring design holds the stop in the up position LifeSpan Limited Lifetime Warranty The stop locks in the up position to allow the door to open freely