1. Introduction
The Bosch WM4 Wall and Ceiling Mount is designed to provide a stable and adjustable platform for positioning rotary and line lasers. This accessory enhances the versatility of your laser tools by allowing precise placement on various surfaces, including walls and ceiling trim. It features a vertical sliding platform for height adjustments and is compatible with laser tools equipped with a 5/8-11 thread.
2. Safety Information
Please read and understand all instructions before using the WM4 mount. Proper use ensures safe operation and extends the life of the product. Keep this manual for future reference.
- Ensure the mount is securely fastened to the wall or ceiling before attaching any laser tool.
- Do not overload the mount. It is designed for laser tools with a 5/8-11 thread.
- Verify the stability of the mounting surface before installation.
- Keep hands clear of moving parts during height adjustment.
3. Package Contents
The Bosch WM4 package typically includes:
- 1 x Bosch WM4 Wall and Ceiling Mount
- Instruction Manual (this document)
4. Product Features
- Versatile Mounting: Positions laser tools on walls and mounts securely to ceiling trim using a clip and clamping screw. Keyhole slots are also provided for wall positioning.
- Vertical Height Adjustment: Features a sliding platform with a locking device, allowing for 6 inches of height adjustment for secure and precise positioning.
- Thread Compatibility: Attaches to laser tools equipped with a 5/8-11 thread.
- Broad Compatibility: Suitable for use with various Bosch laser levels, including GCL 25, GLL2-80, GLL3-80, GRL300HV, GLL2-40, and GRL300HVC.
5. Setup and Installation
The WM4 mount offers multiple installation options for optimal laser tool placement.
5.1 Attaching the Laser Tool
The WM4 mount is designed to securely hold laser tools with a 5/8-11 thread. Locate the threaded screw on the mount's platform and align it with the corresponding threaded receptacle on your laser tool. Rotate the laser tool clockwise until it is firmly attached to the mount.

Figure 1: Bosch WM4 Wall and Ceiling Mount. This image shows the front view of the WM4 mount, highlighting the threaded screw for attaching a laser tool and the measurement scales in inches and centimeters.
5.2 Wall Mounting
To mount the WM4 on a wall, use the keyhole slots located on the back of the mount. Secure appropriate fasteners (screws, nails, etc., not included) into the wall, ensuring they are spaced correctly to engage with the keyhole slots. Hang the mount onto the fasteners, then slide it down to lock it in place. Ensure the mount is stable before attaching a laser tool.
5.3 Ceiling Trim Mounting
For ceiling trim applications, utilize the integrated clip and clamping screw. Position the clip over the ceiling trim or a suitable edge. Tighten the clamping screw until the mount is firmly secured. Verify stability before proceeding.

Figure 2: Bosch WM4 Mount in use with a laser level attached to ceiling trim. This image demonstrates the mount securely holding a laser level, projecting a line across a room, illustrating its practical application for precise leveling tasks.
6. Operating Instructions
6.1 Height Adjustment
The WM4 features a vertical sliding platform for precise height adjustments. To adjust the height, loosen the locking device (typically a knob or lever). Slide the platform up or down to the desired position. Once the correct height is achieved, tighten the locking device to secure the platform in place. The integrated scales (inches and centimeters) can assist in precise positioning.
6.2 Compatible Laser Tools
The Bosch WM4 mount is compatible with Bosch laser tools that feature a 5/8-11 thread. This includes, but is not limited to, models such as GCL 25, GLL2-80, GLL3-80, GRL300HV, GLL2-40, and GRL300HVC.
7. Maintenance
To ensure the longevity and proper function of your Bosch WM4 mount, follow these maintenance guidelines:
- Cleaning: Wipe the mount with a soft, damp cloth to remove dust and debris. Do not use harsh chemicals or abrasive cleaners.
- Storage: Store the mount in a clean, dry environment when not in use.
- Inspection: Periodically inspect the mount for any signs of wear, damage, or loose components. Ensure all screws and locking mechanisms are functioning correctly.
8. Troubleshooting
If you encounter issues with your WM4 mount, consider the following:
- Mount not stable: Ensure the clamping screw is fully tightened for ceiling trim mounting, or that wall fasteners are securely installed and engaged with the keyhole slots.
- Laser tool not attaching: Verify that your laser tool has a 5/8-11 thread. Ensure the threaded screw on the mount is clean and free of debris.
- Height adjustment not holding: Confirm that the locking device for the vertical sliding platform is fully tightened after adjustment.
For further assistance, please contact Bosch customer support.
9. Specifications
| Brand | BOSCH |
| Model Number | WM4 |
| Material | Blend |
| Item Weight | 4.5 ounces (approx. 127.5 grams) |
| Product Dimensions | 3.5 x 2.5 x 6.5 inches (approx. 8.9 x 6.4 x 16.5 cm) |
| Thread Compatibility | 5/8-11 thread |
| Height Adjustment Range | 6 inches |
| Included Components | WM4 Rotary Laser Wall mount |
10. Warranty and Support
Warranty: The Bosch WM4 Wall and Ceiling Mount comes with a 1 Year Limited Warranty. Please refer to the warranty documentation provided with your purchase for full terms and conditions.
Customer Support: For technical assistance, parts, or warranty claims, please contact Bosch customer service. Visit the official Bosch website for contact information and support resources.





