50 de-burring and engraving tools. Industrial diamonds. Fitted with 1/8" shank. Comes in storage case. Great for craft, modelling, home repair and for use on ceramics, tiles, brick, glass, plastics, fibreglass, stone and wood. Specifications: Type: Grinding Head Shank Diameter: 1/8" (3.17mm) Material: Diamond Grit : 120 Application: Stone/Ceramic/Glass/Carbide/gem Package Size: 10x9x5.5mm Largest head size: Approx. 16mm (Close to 5/8") Smallest head size: Approx. 1mm (Close to 1/25"). Package: Plastic box