To determine if the Qoltec product with the manufacturer's product ID "51775" is compatible with your Acer monitor SB220Q, you need to check the following:

- Mounting Type: Ensure that the Qoltec product uses a mounting type (e.g., VESA mount) that is compatible with your Acer monitor's mounting holes.
- Weight Capacity: Verify that the Qoltec product can support the weight of your Acer monitor.
- Size Compatibility: Check if the Qoltec product is designed to accommodate the size of your Acer monitor.

You can find this information in the product specifications or user manual of both the Qoltec product and your Acer monitor. If the specifications match, it should be compatible. If you are still unsure, you may want to contact Qoltec customer support for further clarification.