Yeti Asymmetric 30/35 mm Nickel-Plated Cylinder Yeti cylinder inserts are designed for use in both interior and exterior doors, gates, wickets, roller shutters, and other locks based on a cam element. When using the cylinder outdoors, however, it should be remembered that the cylinder exposed to weather conditions requires more frequent maintenance with appropriate products. Yeti cylinders can also be used as electromechanical components in electrical systems – the cam acts as an on/off switch. Like most cylinders used on the hardware market, Yeti cylinders are made of brass. They are also available with a satin nickel coating, which improves aesthetics and eliminates the problem of copper "tarnishing".