AMPS hole pattern
The AMPS hole pattern is an industry standard for fixings. Here, four holes define a rectangle of 30×38 mm. In most cases, a bracket in this standard contains eight holes so that items can be mounted both horizontally and vertically.
![](https://www.jfuehr.com/wp-content/uploads/2021/02/jf_lexikon_amps_250x250.jpg)