The corners of the tempered glass are now round, which reduces the risk of being scratched by sharp corners. In addition, if for some reason the tempered glass were to break, it would crumble into small granular chunks instead of splintering into jagged shards like plate glass. As a result, it is less likely to cause injuries.The glass shelf bracket is constructed of HEAVY-DUTY Type 304 premium grade rustproof stainless steel, with added 18/8 Chromium/Nickel content to protect against corrosion & rust, suitable for humid environments such as bathroom and kitchen.NON-plastics, metal brackets, and solid construction. MAX. LOAD: 11 lbs(5 kg). Wall-mounted on the concrete walls by using high-quality SUS 304 stainless steel screws.