I was introduced to this by a neighbor and loved it. These cast iron rings are designed to be used with your existing patio fire pit. The idea is to have a hibachi style cooking surface to cook anything from veggies to quick seared wagyu. A company called Breeo out of Pennsylvania creates a smokeless firepit that is incredible, the craftsmanship is top notch. The cooking surface is better for meats, but you can buy the outdoor grill attachments for $140, giving you more flexibility.