Agatec 1-16580 25 Feet Rectangular-Oval Fiberglass Grade Rod (tenths) 5 sections for easy storage Constructed of corrosion resistant and non-conductive fiberglass for job site safety Tight and accurate, the sections lock securely with unbreakable buttons providing unsurpassed durability in the field. Reverse side graduated with height reading scale for height applications Large easy to read graduations make reading the rod easy and accurate.