10 Piece 1.60 mm(.0630")......... CNC PCB DREMEL DIAMOND CUT FLUTE CARBIDE ROUTER BIT.......... Constructed of Industrial Grade Solid Tungsten Carbide........... Manufacturer Union Tool ........... Please note ,These bits are Very Sharp and lightly used and Each Piece has Been Cleaned . These router bits can be used for your plastic, soft media, wood, or metal ....... MADE IN USA