National Hardware Posi-Glide Aluminum Steel Air Controlled Door Closer (Pack of 3).Whether for home, farm, builder or industrial customers, National has all the right hardware in the sizes and finishes you need. With over a century of service National is committed to maintaining the highest level of product quality, innovation and manufacturing technology. UPC: 038613181625 Manufacturer Part No: N181 628 Brand Name: National Hardware Sub Brand: Posi Glide Finish: Aluminum Material: Steel Mechanism: Air Controlled Product Type: Door