... materials:PCB board,Fiberboard,carbon plate,MDF,Acrylic Radius Bottom Engraving Bits Material: Tungsten solidOverall Length: 40-80mmModel ... 15 ° , 30 ° , 45 ° , 60 ° , 90 ° , can be non-standard customization. Processing features: Font carving, v-groove, three-dimensional clearance ... brands of equipment and easy word title keyword: Flat knife, chisel, knife engraving. Radius Bottom Engraving Bits