The Lil' Limer has a fiberglass hopper which has thirteen 1 3/8" holes in the bottom of the hopper. The axle of the Lil' Limer goes through a 2-inch pipe which has a 2-inch x 1/2 inch x 1/4 inch blade welded to the pipe. Each time the wheel makes a rotation the spline wipes out the openings.This keeps the lime agitated so that it can free fall. The fiberglass hopper design will not allow the lime to undermine over the auger. Guaranteed.