I need to fit some wooden blinds into a window recess. For some reason the blinds have been supplied with wood screws but I need to screw the brackets into the lintel (which I assume is brick/concrete). Can anyone help me with regards to choosing the correct raw plugs and screws for this? Are there universal plugs I can buy which will work no matter what the material is? How long should they be and what are the best screws? Not done this before so any advice appreciated!