The versatile 3/32 In. (2.4 mm) diameter Engraving bit is made of high-grade steel for use on wood, plastic, leather, soft metals & rubber. For use with all Dremel high-speed rotary tools, the accessories work well for detailed material removal in applications like shaping, carving, engraving, hollowing, grooving, slotting, inlaying, making tapered holes, or freehand routing. The ball shape of the Engraving bit can be used to make concave cuts or hollows out material - the tip makes round bottom slots and grooves and can be used for rounded side cuts.with all Dremel High-Speed Rotary tools, the accessories work well for detailed material removal in applications like shaping, carving, engraving, hollowing, grooving, slotting, inlaying, making tapered holes, or freehand routing. The ball shape of the Engraving bit can be used to make concave cuts or hollows out material - the tip makes round bottom slots and grooves and can be used for rounded side cuts.