The Adir Pro 16 ft. Grade Rod is made of non-conductive fiberglass and its great for tough construction leveling jobs. It helps users achieve job efficiency and accuracy when engaging in tasks such as landscaping or setting foundations. For better gripping, this rectangular leveling rod has rounded back corners. It consists of 4 adjustable sections with a maximum extension of 16 ft. and it collapses to 57 in. for easy storage. Unbreakable buttons securely lock sections in place and prevent slipping. With no special bracket required, laser detectors can be mounted directly onto the grade rod. Solid Construction. A high quality leveling rod, this Adir Pro grade rod is made of tough, non-conductive fiberglass that is water-resistant and corrosion-resistant. It is rectangular in shape with rounded back corners for easy gripping. Top section has a 5/8 x 11 female thread for attaching a mini prism. There are 4 sections that allow it to extend and retract for transport and storage. These sturdy sections are firmly held in place with unbreakable locking buttons providing increased stability and precision. The Adir Pro Fiberglass Rectangular Leveling Rod's rectangular gives flush alignment with flat surfaces and stores easily in the durable soft carrying case that comes with your purchase. Being an Adir Pro product, you can be sure you are getting great value-for-money and a reliable tool. A 1-year warranty is included.