1This concealed support is used to fix a shelf made of wooden boards on the wall, which does not take up space and beautiful 2You can adjust the left and right to determine the position if the position is not in the right place when the board is slotted 3When 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 4Made of cold rolled steel material with accurate thickness, sturdy and durable 5Partition bracket is suitable for 20 30mm plates which bears a lot of weight, and this accessory needs to be slotted for installation 10 x Concealed Shelf Support Item Type: Concealed shelf supportMaterial: Cold rolled steelFunction: Concealed shelf support, wall partition bracket, furniture connector, bookshelf shelf supportDiameter of Rod: Approx. 12mm / 0.5inSuitable Plates: Approx. 20 ~ 30mm / 0.8 ~ 1.2inTotal Length: Approx. 104mm / 4.1inSize:Approx. 75mm / 3inApprox. 20mm / 0.8inApprox. 55mm / 2.2inApprox. 95mm / 3.7in