... it usually have water-dropping line on the back surface.Popular granite stone colors for window sills:G602, G603, G664, G687, G635 ... straight, with or without stool, we cut and craft the stone window cill to each customer's unique designs.we can also ... threshold, stone lintel, and stone mullions, which are compatiable with the window sills.In addition, we can also supply you other granite ...