I'm trying to hang a picture.
plastic tubes are called raw plugs.... they are for screws. you drill a hole in the wall, and usually the diameter of the hole is too big for the screw thread to bite properly, so hammer one of the plastic tubes into the hole, and then screw in a screw. hey presto it bites solidly and you can hang heavy stuff off it.
drill a little hole for the plastic insert or some you can just hammer into the sheet-rock. these expand and grab the wall better than just putting the screw or nail in. if it is a heavy picture it is better to use the mechanical anchor that is more permanent and holds lots more weight. they make them with pointy ends you just nail in and tighten the screw.
Mainer told you what they were, but I think you already figured that out yourself. First screw or nail the hanger in where you want it. If you don't hit wood, and the picture is heavy, remove the nail (screw) make the hole big enough for the anchor to be forced in. I use a phillips screwdriver ( the round pointed one) and a hammer the put the nail (screw) into the center of the anchor
I think you mean the anchors. They are used when your wall is plasterboard and you can't find a stud to screw/nail into. Putting just a metal screw into plasterboard does not have much strenght for hanging things. The plastic anchor helps spread out the load.
Drill a hole for the sleeve, when you put a screw in it, it will expand, locking the screw in place. However, finding a stud and puting a screw into it is always better.
