Features: *The diamond burr made of diamond electroplated. *All with 2.35mm shank fit electric grinder , engraving machine , hanging mill and other electric rotary tool with 2.35mm collet. *Mainly used for grinding, engraving and hollowing of jade, agate, ceramics, glass, crystal, metal, cemented carbide, etc.. *A total of ten specifications: 0.8mm , 1mm , 1.2mm , 1.5mm , 1.8mm , 2mm , 2.5mm , 3mm , 4mm , 5mm, each one. Specifications: Product name: Diamond Burr Core Material: Diamond Color: Silver Length: (Approx. ) 42-45mm Shank diameter: 2.35mm - 3/32'' Size: 0.8mm , 1mm , 1.2mm , 1.5mm , 1.8mm , 2mm , 2.5mm , 3mm , 4mm , 5mm Suitable for: grinding, engraving and hollowing of jade, agate, ceramics, glass, crystal, metal, cemented carbide, etc.. Quantity: 10Pcs Package Contents: 10 Diamond Burr Core Note: 1.Transition: 1cm=10mm=0.39inch. 2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 3. Please allow slight manual measurement deviation for the data.