Unbreakable Extruded Aluminum Casing (23 5/8" long) 4 Computer Set Vials - 2 for Plumb - 2 for Level Double Elastic Securing Straps (28" stretching to 60") The Level Perfect Corner and Edge Level is a beautifully constructed aluminum post level that will be appreciated by craftsmen. Level Features/Dimensions: Unbreakable Extruded Aluminum Casing (23 5/8" long) 4 Computer Set Vials - 2 for Plumb - 2 for Level Double Elastic Securing Straps (28" stretching to 60")