Both the north pole or south pole of a magnet are equal in holding power and both will stick to magnetic material such as steel or iron. The like poles of two magnets (e.g. north facing north or south facing south) will always repel each other while opposite poles (e.g. north facing south or south facing north) will always attract.
We supply self-adhesive and countersunk magnets with either pole on the 'showing' magnetic face.