... :PCB board,Fiberboard,carbon plate,MDF,Acrylic Radius Bottom Engraving Bits Material: Tungsten solidOverall Length: 40-80mmModel Number: tw-000832Coating: ... features: Font carving, v-groove, three-dimensional clearance angle, chamfer, v-type three-dimensional three-dimensional sculpture may reflect the tip is ... easy word title keyword: Flat knife, chisel, knife engraving. Radius Bottom Engraving Bits