Spectra Precision C59 Rod Clamp The Spectra Precision C59 Rod Clamp is a durable laser receiver mounting accessory designed for secure attachment of the HR320 laser receiver to standard grade rods in construction and leveling applications. Its rugged clamp design provides stable receiver positioning for accurate elevation and grade measurements in demanding field conditions. Key Features • Compatible with Spectra Precision HR320 receiver • Secure rod clamp design for stable field mounting • Supports accurate grade and elevation measurements • Durable, lightweight construction-ready accessory