Overview for LaserLine B-550 Aluminum Bracket for Trimble HR550 Laser Detector The LaserLine B-550 Detector Bracket attaches to any LaserLine Direct Reading laser rod. It allows for faster and easier readings without the need of having to loosen, move and then tighten the detector. The LaserLine B-550 Detector Bracket is compatible with Trimble HR550 laser detector model. It is made up of lightweight extruded aluminum in a black anodized finish. Through the special rail equipped