The window frame fixing piece is splayed or uniformly high inside and low outside.

High inside and low outside. Aluminum alloy window fixer is a special accessory product for fixing aluminum alloy windows. The internal height of door and window fixing parts is lower than the external height, which is not the requirement of the specification, but the choice made according to the thickness of the wall. Because some walls are not thick enough, the thickness of the walls can be better utilized by tilting the fixing pieces, and it is also easy to install under the condition of high inside and low outside.