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Specification: Material: Carbide Edge: 3 Shank: 3.175mm Tip: 0.1mm Degrees: 20 30 45 60 90 Application: Majority of Plastics , PCB, Copper, Aluminum, Acrylic, PVC, Nylon, Resin, Wood, Plywood, Hardwood, Glass fiber, Marble, etc. NOTE: When engraving harder materials, it is necessary to increase the speed and reduce the feed rate to avoid tool breakage WHAT'S INCLUDED? 2pcs 20° x 0.1mm 3 Edge Pyramid Engraving Bits 2pcs 30° x 0.1mm 3 Edge Pyramid Engraving Bits 2pcs 45° x 0.1mm 3 Edge Pyramid Engraving Bits 2pcs 60° x 0.1mm 3 Edge Pyramid Engraving Bits 2pcs 90° x 0.1mm 3 Edge Pyramid Engraving Bits