Power Tools for Professionals



Positioning Device

The Bosch BM 1 positioning device features a microfine height-adjustment system for quick horizontal level adjustment, as well as the versatility to work with a variety of levels, due to its 1/4 In.-20 mounting screw. The microfine adjustment system includes a knob to adjust the horizontal line height while mounted, which eliminates the user from having to remount if the tool is not at correct level. The device features very strong magnets for mounting to metal surfaces. It has other mounting systems, such as slots for screws or nails, clip attachment for ceiling grids and raceways for optional straps. The mount also has retractable feet, so that it is freestanding to use as a mini tripod. It also has two different threaded mounts on the bottom (1/4 In-20 and 5/8 In-11). This gives it the versatility to be used with standard tripod or pole mounts.

Read more Show less


  • (1) BM1 Positioning Device


  • Versatile positioning device design – offers adaptability, with microfine height adjustment, retractable feet for freestanding mode, 1/4 In.-20 mounting thread and multimounting systems
  • Microfine height-adjustment system – provides quick adjustment and secure locking of the working height
  • Strong magnets – allows for quick positioning to metal surfaces
  • Threaded mounts (1/4-In. x 20 and 5/8 In. x 11) on bottom – affords flexibility, allowing attachment to standard tripod or pole mounts
  • Retractable feet for freestanding use – allows use as a mini tripod
  • Multimounting system – features strong magnets, 5/8 In.-11 and 1/4 In.-20 thread, slots for screws or nails, and raceways for optional straps
  • Clip attachment – offers quick setup in ceiling grid applications

Technical Data

Height Adjustment Range 2-1/2" (60 mm)
Length 9.1"
Material Plastic
Weight 2.53lb
Width 7.0"
Works With Combination/Point Alignment Lasers
GCL 2-160, GCL 25, GCL100-40G, GCL100-80C, GCL100-80CG, GPL 5, GPL 3, GPL 2, GPL100-30G, GPL100-50G
Line Lasers
GLL 30, GLL40-20G, GLL 55, GLL 100 G, GLL100-40G, GLL 3-50, GLL 2-20, GLL50-40G, GLL3-330CG, GLL3-330C, GLL3-300, GLL 150 ECK
Includes (1) BM1 Positioning Device
Read more Show less

Owner's Manual



Customer Support

Have a tool, accessory, application or service question?
Call us at 1-877-BOSCH99 (1-877-267-2499) or visit the Frequently Asked Questions.

Search for Parts Diagram

Locate and download the parts diagram for your tool.

Product Registration

Protecting your investment in Bosch power tools can save you time and money in the future.

Order Spare Parts

Order your genuine Bosch parts here.

Service Hotline

Call our Service Hotline or use our contact form.

1-877-BOSCH99 (1-877-267-2499)

Mon-Fri: 7:00-19:00 CST


Visit the Frequently Asked Questions section.

We may already have the answer for your questions.

Show FAQ

TEXT Customer Service

Have a service related question? Text us here.

Mon-Fri: 7:00-19:00 CST