Made of high quality zinc alloy, smooth surface, abrasion resistant, high hardness No need open hole, easy installation and long service life over 50,000 times Round edge, fits your folding table perfectly and the holes are aligned Very high quality mechanism that slowly pulls the table surface and closes for silent movement Suitable for many surfaces such as computer desk, sewing machine, windows, doors, folding table, etc This item slowly pulls the table surface and closes for quiet, smooth motion. It is designed for sewing machine, folding table and other furniture. No open hole needed, easy installation and long service life over 50,000 times. You can rest assured to buy it because it is made of high hardness zinc alloy, durable to use. Features: Made of high quality zinc alloy, smooth surface, abrasion resistant, high hardness. No open hole needed, easy installation and long service life over 50,000 times. Round edge, fits your folding table perfectly, and the holes are aligned.