Features: 1.This concealed support is used to fix a shelf made of wooden boards on the wall, which does not take up space and beautiful 2.You can adjust the left and right to determine the position if the position is not in the right place when the board is slotted 3.When the board is installed with a slot, if the board is not flat, the screws can be adjusted up and down to balance the board 4.Made of high quality cold rolled steel material with accurate thickness, sturdy and durable 5.Partition bracket is suitable for 20 ? 30mm plates which bears a lot of weight, and this accessory needs to be slotted for installation specification:Item Type: Concealed shelf support Material: Cold rolled steel Function: Concealed shelf support, wall partition bracket, furniture connector, bookshelf shelf support Diameter of Rod: Approx. 12mm / 0.5in Suitable Plates: Approx. 20 ~ 30mm / 0.8 ~ 1.2in Total Length: Approx. 104mm / 4.1in Size: Approx. 75mm / 3in Approx. 20mm / 0.8in Approx. 55mm / 2.2in Approx. 95mm / 3.7in PackageList:10 x Concealed Shelf Support