Centering Pegs screw into the bottom post (anvil) of the Impress, to keep your tubing centered and straight, beneath the cone. Flaring Dies are essentially the same thing, but for smaller diameter tubes, like 3/32 and 1/8 inch. In addition, the wider, flat area around the central peg of the Flaring Die acts as a forming surface. The tube is pressed down against this surface, instead of against the anvil. This is needed because the smaller tubes are too small for a regular peg to work, because the OD of the tube is actually smaller than the hole in the anvil that the pegs are screwed into! The wider head of the Flaring Die covers the screw hole.
