STURDY & DURABLE?The folding shelf bracket is made of premium polished 304 stainless steel with strong smooth surface & srecise sction.build to resist daily scratches, corrosion and tarnishing. SPACE SAVING?Collapsible shelf brackets lock at 90 degrees. Excellent performance suitable for limited spaces when you want a work surface that can be folded down and out of the way. ?BRACKET SPEC?15.8 * 7.9 inch; Max load: 198 lb/90 kg. Triangle shape is the sturdiest construction in wall brackets currently. Enough to be used as bookshelf, kitchen shelf, exhibition stand, garden shelf, external wall brackets etc.