Adjustable Grade Rod Level Aluminum Alloy Survey Rod Bubble Level for Round and Rectangular Bars: Feature: 1. Aluminum Alloy Rod Level, sturdy and hard wearing. 2. Adjustable vial for precise calibration. 3. Versatile design for round and rectangular bars. 4. Large vial for high visibility. 5. Long lasting, suitable for professionals. Specification: Item Type: Adjustable Grade Rod Level, Material: Aluminum Alloy, Color: Black, Vial Diameter: Approx. 2.22cm / 7/8in. Package List: 1 x Adjustable Grade Rod Level, 1 x Wrench.