Seco Adjustable Offset Bar The Seco 5198-163 Adjustable Offset Bar is designed to support accurate elevation measurements in hard-to-reach locations , making it ideal for applications such as sewer inverts, bridge work, and complex construction layouts. It mounts to standard survey poles and allows users to offset measurements while maintaining precision. Key Features • Adjustable centerline: 1.00 to 1.60 ft (30.48 to 48.76 cm) in 0.20 ft increments • Compatible with standard 5/8" x 11 survey poles • Brass male 5/8" x 11 post and stainless steel Heli-Coil® insert • Constructed from 1/2" thick anodized aluminum for durability