1. A device having a body with a central axis with at least 20 pyramidal point structures arranged in three circumferential rows around the axis, an axial conical point structure extending from the body, and no axial conical point structure on a side of the body opposite the axial conical point structure, with each of the pyramidal point structures and the axial conical point structure having a height of at least 0.1 inch and comprising steel, iron, or ceramic, the device having an overall maximum diameter of 0.5 inch to 1.5 inch, a weight of 0.5 ounce to 3 ounces, and a density of all the point structures of at least 5 points per square inch,