Here is the tutorial
Start SolidWorks in part mode.
Choose Top Plane>>Sketch and draw a rectangle of 250mm by 120mm.
Extrude it by 20mm. This will be our plate on which we have to create hole.
Under features tab choose Hole wizard.
Choose Standard - IS or whatever, Type Counter Sunk & Size M10.
Choose Position tab in hole wizard property manager and choose the place for hole to be created.
Use smart dimension tool and dimension it.
Click OK and we have hole created.