Our roller arm stays are designed for use with bottom hung fanlight windows. Fitted to the frame to restrict movement of the fanlight window when opened. When closed, the roller arm hangs vertically downwards against the frame. Available in two sizes and sold in singles. Supplied with matching SS wood screws. Specifications: Dimensions: H:22.2 x W:1.6 x D:1.6 cm, Weight: 0.2 kg, Colour: Black, Guarantee: 5 years, Material: Mild Steel, Model Number: 83848. A roller arm against which a window rests when open. Our handmade blacksmith range is still made by hand in the traditional way. The From the Anvil ethos is to have nothing in your house that you don't know to be useful or believe to be beautiful.