Sold as a pack of 5 parking brake knobs for air valve control on Mack trucks, each unit and paired with a spiral pin for installation. The knob measures 2.3 in. wide, 2.3 in. high, and 1.4 in. long and mounts on the dashboard or control panel to work the parking brake valve, applying or releasing the spring brakes. It also fits certain Navistar applications.Interchanges:Mack 25092418Mack 25MY32P12Mack 745-248433Navistar 1676711C1This unit is sold in packs of 5.FeaturesParking brake knob for air valve controlSold as a pack of 5 unitsEach unit includes a spiral pin for installationDimensions: 2.3 in. H x 2.3 in. W x 1.4 in. LTech SpecsHeight: 2.3 in.Width: 2.3 in.Length: 1.4 in.Pack quantity: 5 piecesKit includes: Parking Brake Knob (LVK-3602-001) and Spiral Pin (LPN-5119)