Crain or Mound City- Rods are designed for multiple uses in 16 & 25 feet lengths. They are rectangular-oval shaped telescoping Fiberglass Leveling Rods in both English and Metric.Outstanding features: Rectangular-oval shape for easy handling. Rod face is protected by special reinforcing ribs to help resist the scraping of the numbers, and breakage, while adding stability. Measuring scale on back side gives user overall height at eye level, back also has range markings. 25' weighs 8 lbs, while the 16' weighs 4 lbs, both retract to 5', and are easy to disassemble to clean. 5/8-11 threaded prism adapter available Carrying Case made of nylon included. Laser level detector brackets are available for many brands of lasers (call for pricing and availability. See NEW snap-tite Level Vials C91255 and C91535.