Brand new and high quality nickel bonded diamonte These high speed diamonte coated cutting discs can be used with your rotary tool to cut a wide variety of materials. Cut wood, glass, plastic, metal, marble, masonry, stone, concrete, and fiberglass. For use in tight places and for flush cutting. Size: Shank diameter:3.175mm( 1/8") bore Shank Length:36mm/1.42" Disc diameter: 16mm/0.63" Shank diameter:3.175mm( 1/8") bore Shank Length:36mm/1.42" Disc diameter: 18mm/0.71" Shank diameter:3.175mm( 1/8") bore Shank Length:36mm/1.42" Disc diameter: 20mm/0.79" Shank diameter:3.175mm( 1/8") bore Shank Length:36mm/1.42" Disc diameter: 25mm/0.98" Shank diameter:3.175mm( 1/8") bore Shank Length:36mm/1.42" Disc diameter: 30mm/1.18" Shank diameter:3.175mm( 1/8") bore Shank Length:36mm/1.42" Disc diameter: 30mm/1.18" Shank diameter:3.175mm( 1/8") bore Shank Length:36mm/1.42" Disc diameter: 35mm/1.38" Shank diameter:3.175mm( 1/8") bore Shank Length:36mm/1.42" Disc diameter: 40mm/1.57" Shank diameter:3.175mm( 1/8") bore Shank Length:36mm/1.42" Disc diameter: 50mm/1.97" Material: Nickel plated steel Max Speed: 20,000 RPM Note : Add some water for coolant when using it. Package included : 5 x 18mm Diamonte Cutting Discs 1 x Drill Bit