This die extrudes a hollow cylinder. The die is compatible with 4" round Brent clay extruders. Great for a vase or a drinking glass. Extrusion Dimensions: The extrusion is 3" in outer diameter with 6mm walls. Die Dimensions: Overall dimensions are 4 1/2" in diameter and 7/8" tall. Base Cutter: The Base Cutter is optional. It cuts a match...