The Carlisle Brass 305mm Solid Brass Plain Victorian Window Stay Polished Chrome, sometimes referred to as the ‘Spoon’ end stay by virtue of its shape. This size is normally used on the main window sashes. Casement Stay Size The general rule of thumb for selecting the appropriate length of window stay is that the stay length should be about 50% to 60% of the casement width. The length of the stay will determine to some extent the degree of opening; however the actual selection of the length is also a matter of personal preference. Cranked & EJMA (Angled) Pins For ...