How strong are the Kinook blocks ?
    Constructing with the Kinook system provides solid bases for horizontal shelves, see DIY Techniques page.

Kinook blocks are made of plastic and are not solid enough to support heavy weights. Kinook blocks are used as guide to mount a metallic structure that will be covered with panels (plasterboard, wood, melamine etc...). It is important to build your construction with panels and metallic studs solid enough to support the mechanic effort (e.g..:weight). Size them accordingly to the use your construction is intended for.