BBQGuys Signature Lava Rock - Black - 7 Lbs - FPR7

BBQGuys Signature Lava Rock - Black - 7 Lbs. FPR7. Fire Pit Lava Rock. This item is perfect for outdoor fire pits. The following are recommendations only for the amount of rocks one needs for various fire pits: It takes 8 bags to cover the diameter of a 24 inch pit 1 inch in depth. It takes 12 bags to cover the diameter of a 30 inch pit 1 inch in depth. It takes 20 bags to cover the diameter of a 36 inch pit 1 inch in depth. It takes 32 bags to cover the diameter of a 48 inch pit 1 inch in depth. The rocks range in size, starting as small a dime to as big as quarter. Approximately 1/4 inch to a 1/2 inch in size.