An anvil is a steel or iron tool used mainly as a hitting surface for setting rivets. Most anvils are solid metal, while others can have hollowed-out areas that serve specific purposes. These can include grooves in for straightening metal pieces, or areas for loose hardware or accessory storage. Anvils commonly sit on top of tables or work benches.
Common anvils are solid and usually have a wide, flat surface. They also have a rounded, curved end that tapers into a point. The flat surface is great for hitting on, as it absorbs a lot of the force. The curves end is great for hitting pieces on a unique angle or for shaping curved items.
Anvils are available in many sizes, often denoted by weight. They range in size from a few ounces up to 50+ lbs for larger ones.