Bosch Positioning Device for Line and Point Lasers BM3 ADJUSTABLE: The Bosch BM3 Positioning Device features very strong magnets and extendable legs for most interior applications as well as a fine adjustment knob for accurate alignment of horizontal laser line. VERSATILITY: The BM3 mount works with all line lasers up to 1 lb. due to its 1/4-inch to 20 thread. The laser can be used for all applications without detaching from the mount. COMPACT: Compact enough to fit into pouch while still attached to the line laser for easy and quick portability. VALUE: Includes a clip that is ideal for fast and easy set up during ceiling grid applications ATTACHABLE: The BM3 mount can be used in many different ways by magnetically attaching to a metal surface, setting it on the floor or mounting it to drywall with screws.