Features: brand new and high quality. Compatibility: With 3 mm shank, designed for multi functional tool and most grinders or rotary tools. Excellent for fine detail work, cutting, engraving, carving, touch-up and finishing. Diamond Rotary Burr Set : 50 Assorted Different Grinding Heads, 1/8 Inch (3.15mm) Shank, 150 Grit for fine detail work.Includes 50 assorted shapes covered with diamond particles, which meet your different needs perfectly. Multi-purpose: Use on Stone, Jade, Jewelry, Wood, Ceramic, Tile, Glass, Carbide, Gem, Metal and other hard materials. Multifunction: Idea for abrasive, engraving, carving, cutting, sanding, polishing, grinding.Suitable for DIY, engraving, carving, cutting, sanding, polishing, grinding, etc. Shank Diameter: 1/8-inch,for most die grinders or rotary tools.Applicable to jade carved fine grinding, stones jade processing and so on, the effect is excellent. Specifications: Material: Electroplated Emery Package Size: approx 10.8x9.8x5.5cm/4.25x3.86x2.16 inches Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 50x/Set Diamond Grinding for Head Carving Burr Set