Features: brand new and high quality Very rough coatings allow quick stock removal while maintaining a relatively smoothly finish, very efficient. Made of carbon steel material, hardened and uniquely polished to make spherical burrs durable. The cutting edge has undergone a unique fine polishing treatments, and the cutting edge is of sharpness and neatly arranged to grind wood more smoothly. Cylinder file is suitable for wood and metal carving, grinding, engraving, very practical. suitable for most type angle grinders, provide great convenience. Specifications: Material:Carbon Steel Type:20mm/25mm/30mm 20mm Size:Approx. 20x97x25mm/0.78x3.81x0.98inches 25mm Size:Approx. 25x103x25mm/0.98x4x0.98inches 30mm Size:Approx. 30x108x25mm/1.18x4.25x0.98inches Package Includes: 1x Grinding Head 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.