The AdirPro 790-01-CLP Mounting Clamp for LD-8 Laser Detector has a built-in bubble level to aid in the precise placement of your LD-8 laser detector (sold separately). The clamp adjusts with the twist of a button. You can use this mounting bracket to attach your receiver to a variety of items, including most prism poles and survey rods. A 1/4” mounting screw secures the receiver.