1.please match size in mm to cm. 2. TOUGHENED GLASS SIZE IS (575=575)330 MM . 3, 4MM TOUGHENED GLASS ISI MARKED 4. WELL SIDE EDGES FINISHED THAT PROTECT TO BREAKAGE EASILY, 5. COMPATIBLE MODEL IS SAMSUNG RT39, RT42, ETC 6. IT IS main toughened GLASS shelf. Toughened glass, also known as tempered glass, is a type of glass that has been specially treated to make it much stronger and more durable than regular glass. It undergoes a process of extreme heating and rapid cooling, which increases its strength and makes it resistant to impacts and temperature changes. If broken, toughened glass shatters into small, blunt pieces instead of sharp shards, reducing the risk of injury. This makes it ideal for refrigerator shelves, doors, windows, and safety applications where durability and safety are essential. The ISI Marked Toughened Glass for Refrigerator by Tiksha Enterprises is a high-quality fridge shelf that is both strong and stylish. It comes with rose gold, yellow gold, or silver mirror-finished beading edges, giving your fridge a fancy look. The edges are made from top-quality steel metal (202/304 standard) for extra durability. The toughened glass makes it safer, harder to break, and long-lasting. With an ISI certification, you can trust that this shelf is reliable and perfect for modern refrigerators.