Weidmueller SCREWTY M12F KO O. SD

Therefore, "SCREWTY M12F KO O. SD" most likely describes a precision tool (perhaps a tap, die, or specialized driver) for M12 fine 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.