Bosch Positioning Device for Line and Point Lasers BM1 ADJUSTABLE: The Bosch BM1 Positioning Device offers micro-fine height adjustment system for quick adjustment and secure locking of the working height for both line and point lasers. FREESTANDING: The BM1 comes complete with retractable feet for freestanding use MOUNTABLE: With a multimounting system featuring strong magnets, 5/8-Inch-11 and 1/4-Inch-20 thread, slots for screws or nails, raceways or optional straps, the Bosch BM1 Positioning Device is ideal for any jobsite. EASY SET-UP: The included clip attachment allows for quick setup in ceiling grid applications while the fine adjustment knob allows for precise alignment of the line laser.