Lead came
Lead came is the grooved strip of lead that holds the pieces of glass together in a leaded light or a traditional stained glass window. In cross-section it is shaped like a letter H: two channels, sometimes called leaves or flanges, grip the glass on either side of a central web, which is also known as the heart.
Came is sold in many widths, from fine strips of about 3 mm to broad sections of 25 mm or more, and in flat-faced and round-faced profiles. Traditional came is cast or milled from soft lead alloy. It is stretched before use, which straightens it and makes it stiffer, then cut with a lead knife and soldered at every joint.
Because lead is soft, a large panel needs support. Horizontal saddle bars or reinforcing bars are fixed across the opening and the panel is tied to them. Over many decades lead can sag and fatigue, which is one of the common reasons old windows are releaded.