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3mm router bit, 10Pcs HSS Router Engraving Bits & 10Pcs Router Bit with 1/8"(3mm) Shank Power Rotary for DIY Woodworking, Carving, Sculpting, Engraving, Drilling. - Amazon.com, Slot Undercut Bit, Cut Depth, 3mm Cut Length, Shank, Southeast Tool SE3114