Hi guys,I need to put some shelves up in bedroom BUT the house we live in has modern stud walls( I think that's what they are called) ie plastered but hollow ,what are the screw type fittings called that would hold the shelving called? We recently had the kitchen fitted and on one side was one of these walls and the guys used some special type of screws to hold the cabinets so I am looking for the name of the screws,they just screwed the screws straight into the walls....it was NOT the type that open up from the back as you screw into them (the anchor type)...hope you understand my question and explanation,many thanks in advance