Ball chisel file grinding heads: Use fine polishing treatment, akuminate edge and wear resistance, which is particularly suitable for processing. Wear-resistant grinding ball: carbon steel quenching process can increase wear resistance and has long service life. Function: Widely used in all wood materials such as carving, crafts, grinding, polishing and wood finishing. Practical Accessories: Suitable for DIY enthusiasts or hobbyists and crafts enthusiasts, it is a practical accessory for woodworking tools. size: 14mm Material: Carbon Steel colour: black Package Contents: 2 x Ball end mill wood carving Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.