Item Description: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 .For use in tight places and for flush cuttingSizeShank diameter:3.175mm( 1/8") boreShank Length:36mm/1.42"Disc diameter: 16mm/0.63",18mm/0.71",20mm/0.79",25mm/0.98", 30mm/1.18",35mm/1.38",40mm/1.57",50mm/1.97"Material: Nickel plated steelMax Speed: 20,000 RPMItem Specification:DIY Supplies: ELECTRICALType: GlassDrill Bitlength: 36mmUse: Masonry Drillingis_customized: YesMaterial: Diamond