Specifications: Polishing grinding heads have high-quality abrasive head and 3mm shank handle. You can use it with electric grinder(not included), crane grinder(not included), wind grinder(not included), electric drill(not included), etc. They are perfect tools for DIY polishing, polishing jade/wood/metal, etc. Type: Grinding Head Shank Diameter: 3mm Material: Rubber, PA Chrome-Corundum, Fake Wool Features: Mixed Tip, Assorted Size, 3mm Shaft, Durable, Polishing Accessories Storage Box Size: 11.5cm x 11.5cm x 6cm/4.52" x 4.52" x 2.35" (Approx.) Grinding Head Size: 3mm x 4mm/0.12" x 0.16", 3mm x 5mm/0.12" x 0.2", 3mm x 8mm/0.12" x 0.32", 3mm x 10mm/0.12" x 0.4" (Approx.) Notes: Due to the light and screen setting difference, the color of item may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 100 x Grinding Head (Cylindrical/Pointed Tip)