Weidmueller SCREWTY-SW13-DM

Therefore, SCREWTY-SW13-DM most likely refers to a small, precision tool (possibly a wrench or specialized driver) with a 13mm size, and the "DM" is likely a product code or specification.  It's probably used for small mechanical or electronic assemblies. To be absolutely certain, it would be best to check the manufacturer's catalog or product information.