1.Which window handle do I need? When a window handle breaks, there is usually a sense of panic about finding a replacement. That is why we have created a guide to help you save time. · It begins with identifying what material the window is made of: PVC, aluminum or wood · Describe the type of window: casement, tilting and revolving, pivoting, sliding sash, roof window. · The window opens on the right or left 2. How do I know what kind of roller shutter I need? 3.Can I install just one wind sensor? 4.What do I make Biohy products?