National Hardware® V1335 medium duty air controlled door closer is designed for use on out swinging wood or metal doors up to 1-3/8" thick. Door closing speed is fully adjustable. Two hole end plug allows closing force to be regulated. Extended operating life as closer is permanently lubricated. Includes convenient "hold-open" washer.• Finish: White• Material: Aluminum tube - steel rod, steel jamb and steel door brackets• Door closing speed is fully adjustable• Designed for use on out swinging wood or metal doors up to 1-3/8" thick• Two hole end plug allows closing force to be regulated• Includes convenient "hold-open" washer• Extended operating life as closer is permanently lubricated.