Weidmueller SCREWTY M8 KO O. SD

Therefore, "SCREWTY M8 KO O. SD" most likely describes a precision tool (perhaps a tap, die, or specialized driver) for M8 threads. The "KO" and "O. SD" parts are likely product codes or specifications unique to the manufacturer.  The "SCREWTY" designation strongly suggests it is part of a set or kit. To get the precise definition and specifications, you would need to consult the manufacturer's documentation or catalog.