When selecting a round-bottom tapered tool, focus on the cutting angle, base arc radius, number of flutes, material, and workpiece material. The cutting angle determines the depth and precision of engraving—small angles suit fine patterns, while larger angles offer better rigidity. The base arc radius affects surface smoothness, with smaller radii providing sharper details. Single-flute tools offer superior sharpness and chip removal, ideal for soft materials; double-flute tools provide greater rigidity and vibration resistance, suitable for hard materials. Tool material influences wear resistance—choose single-flute high-finishing tools for acrylic or PVC, and double-flute stable tools for solid wood or MDF. Proper matching based on machining precision, material hardness, and machine spindle speed ensures smooth engraving results, reduced edge chipping, and extended tool life.