With high hardness and durable design, this product has a high working efficiency, perfect grinding effect and long using life. With conical and cylindrical design, this product can be used compatible dressing, engraving, grinding, polishing molds, copper, aluminum, metal, plastic, jade, jade, agate, wood, etc. Made of stone and metal, this product is more durable and sturdy. There are 2 types of the product(cylindrical, conical), and there are many sizes of it. It is suitable compatible electric grinders, crane grinders, electric drills, wind grinders, etc. Item Name: Grinding Head Material:Metal,Stone Size Details: Type1/2 (Cylindrical/Conical):Handle:3mm/0.1",Grinding Heads: 4mm/ 0.2" (Approx.) Type3/4 (Cylindrical/Conical):Handle:3mm/0.1",Grinding Heads: 6mm/ 0.2" (Approx.) Type5/6 (Cylindrical/Conical):Handle:3mm/0.1",Grinding Heads: 8mm/ 0.3" (Approx.) Type7/8 (Cylindrical/Conical):Handle:3mm/0.1",Grinding Heads: 10mm/ 0.4" (Approx.) Type9/10 (Cylindrical/Conical):Handle:3mm/0.1",Grinding Heads: 12mm/ 0.5" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 10 X Grinding Heads