Diamondback Ironworks, proud manufacturer of American made forges since 2004, offers: The 3 Burner Knifemaker Model Exterior dimensions are 18 1/2" long, 7 1/4" wide and 7 1/2" high Interior dimensions are 18" long, 4 1/2" wide and 3 1/4" high End Openings are 4 1/2" wide x 2" high. There is an opening at each end of this unit to allow long stock to pass through. The liner is lightweight refractory, with the burner flares cut into the refractory material. The walls and ceiling are insulated with Ceramic Hardboard. The floor uses a dense refractory brick to handle the high mechanical wear the floor must endure. The floor is easily replaced without having to take the Forge apart, it simply slides out the end openings! Regulator, hose and gauge included, all you will need is a full tank of Propane. Free shipping is to the lower 48 States only.