1.2.For installation directly into wood work or masonty3.For the concealed mounting of shelves(no visible support).4.Angle adjustment via supporting pin which presses on the rear plate when turned in.5.Each bracket holds 15lbs,For heavier shelves extra brackets to distribute the weight.HOW TO USE BLIND SHELF SUPPORTS:STEP 1: Place your first bracket against the wall, using a spirit level to make it's level. the fixing-hole positions with a pencil.: Using the pencil marks, drill holes into the wall. Always screws or fittings that are suitable for the material of your wall. Screw the bracket into place.STEP 3: the shelf onto the bracket to check that it's level (use the spirit level to make ). you're happy with the position of this shelf and the way it looks, it back off the bracket so that you can position the rest of the brackets.STEP 4: all the brackets are in place, the shelves on and fix into place with the small screws provided with the shelf, using the -drilled holes on the underside of each shelf.Specifications:Colour:BlackMaterial:MetalSize:125mmPackage Contents:6 * Shelf Brackets10 * Strong Screws10 * Wall PlugsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.