Features:Main Material: Made of all stainless steel, the hard plastic is thicker and more rust-proof than the iron spray paint, and the support arm is equipped with a new stable spring, which solves the problem of the support arm shaking and the sash swinging abnormal noise when the wind blows.Base Installation: Universal type(for swing windowdoor), use an electric drill to drill holes on demand, the gear lever and the buckle seat need to be installed with a drop, (the dislocation installation is to avoid the collision between the support arm and the buckle seat when the window is closed and the window cannot be closed), the thickness of the sash is greater than 12mm, it can be installed in the front or in the opposite direction. The thickness of the sash is less than 12mm and can only be installed in reverse; The plastic-steel type(for inside window door) needs to match the handle with a hole distance of 43mm, and the distance from the edge of the handle to the sash is less than 16mm, otherwise the buckle seat needs to be installed in reverse.Home Safety: The inward window lock helps limit the opening width and keep your children safe and prevents them from pinching fingers or falling.Main Function: It can control the size of the window opening to prevent strong wind from blowing in, while also maintaining air circulation.Applicable Occasions: The window restrictor is suitable for home, offices, hospitals, hotels, school, day cares and commercial applications.Specifications:Type: A= Inside WindowDoor, B=Swing WindowDoorMaterial: Stainless SteelColor: SilverSize: AboutGear Lever(L*W*T): S: 125x20x1.9mm/4.92x0.79x0.07inch, L: 166x20x1.9mm/6.54x0.79x0.07inchBuckle Seat(W*H): A: 63.3x64mm/2.49x2.52inch, B: 53.4x53.4mm/2.1x2.1inchHow To Install(Type A):Remove the inner handle, install the buckle seat under the handle, align the hole position, tighten the handle screw, and install the hook rod at the upper/lower endPackage Included:2pcs x Gear Lever2pcs x Buckle Seat4pcs x ScrewOr2pcs x Gear Lever2pcs x Buckle Seat10pcs x ScrewNote:1. Due to the light and screen difference, the item&039;s color may be slightly different from the pictures.2. Please allow 0.5-2 cm differences due to manual measurement.