Radius Bottom Engraving Bits material:solid tungsten carbide engraving materials:PCB board,Fiberboard,carbon plate,MDF,Acrylic Radius Bottom Engraving Bits Material: Tungsten solidOverall Length: 40-80mmModel Number: tw-000832Coating: NOTHING Degree: 15/30/45/60/90. Application processing materials: Acrylic, color plates, PVC, plastic, resin, nylon, aluminum panels, MDF and other specifications: ...