You need the following to assemble: Screwdriver/drilling machine, metal saw (if adding top tracks and/or adjusting top track widths), leveller. Before you start: Make sure you have chosen the right screw/plug for your wall type.The recommendation, when mounting the top track, is to use Elfa hardware. We recommended that a screw should be placed in every hole, for maximum saftey.  The screw holes in the top track are shaped oval, in order to increase the probability to find studs to mount in. Important NOTE: Be careful not to drill into any electrical wires, ductwork, plumbing or other damagable components. If you have any questions on the locations of these wires or lines, please contact a professional electrician or plumber before drilling. Step 1: Place the top track at the desired height and mark one hole in the middle. Step 2: Begin drilling the marked hole with a 3mm (1/8") drill bit. If you hit a stud, continue drilling the entire length of the bit. If you hit the hollow part of the wall, enlarge the hole with a 10mm (3/8") drill bit for anchors. Step 3: Fasten the top track with a screw and tighten it enough to hold the top track against the wall. Place a leveller on the top of the top track and adjust it as required. Mark all remaining holes. Step 4: Hang the hang standards. If you wish to connect two top tracks: Start by mounting the longer piece of track on the far left. Before you mount the connecting top track, you’ll need to cut and remove the end stop on the left side of the track – there’s a marking 28 mm (1-1/8") from the edge on the back side of the top track indicating where to make the cut. Use a metal saw to get a clean cut. When splicing/joining 2 top tracks, and there is no room for protrusions (for example when mounting a system wall-to-wall), the joining/additional top tracks needs to be cut/trimmed (we recommend cutting the left side). The minimum possible width of a cut top track is 184 mm (7-1/4"). And in this case, the cut needs to be on either end of the top track so that 2 screw holes remain. Also, when cutting a top track, the cut needs to be minimum 3 mm (1/8") from a screw hole or cut out.