... hook goes through a rigorous pretreatment process to ensure the metal surface is free from impurities, it’s then coated ... to prevent corrosion. 1. Specification: 1). Material: metal. 2). Length: 10cm, 15cm, 20cm, 25cm, 30cm. 3). ... 3) Grid panel, gridwall rack, slatgrid rack, wire basket, grid hook, waterfall & etc. 4) Accessory rack, CD rack, literal rack 5) Supermarket shelf, wall ...