Supermarket shelf accessories square tube beam 30*15 mm90cm, the beam that can hang things with a hair hook, the metal is relatively strong. There are still about 200 pieces, and the price is cheaper than that. Hook, 29cm long, can be strong, basically hang anything. Wood bracket, used for shelf support. It is suitable for most wooden boards with strong materials and can support most product requirements. Square tube bracket, those who understand and use less know.