Package Contents: You will receive 4 pieces of dog nail grinder replacement heads, which can be used interchangeably for longer life. Product Material: Our replacement parts are made of solid brass shaft and diamond wheel; the brass shaft provides high stability, and the diamond wheel is strong and wear-resistant. Product Advantages: These replacement heads can be cleaned with water after removal—simply wipe dry. Designed to help maintain your dog's nails effectively. The nail grinder replacement head features a solid brass shaft for extended life and greater stability. The grinding heads are easy to clean; remove the head from the nail grinder and clear any debris. Easy To Use & Install: These dog nail grinder replacement heads are easy to install—remove the old head and insert the new one, ensuring it is firmly in place. Color: Gray Material: Diamond Size: 21x13mm Package Contents: 4 * Dog Nail Grinder Replacement Heads Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual product. Measurement may vary by +/- 1-3 cm due to manual measurement.