Oster Replacement Grinding Kit is a set of 8 interchangeable sanding rings for grinders along with a head. The included medium sanding rings have a grit of 60, designed for general sanding and suitable for most types of nails. For smoothing and gentle sanding, rings with a grit of 100 are recommended, particularly useful for small animals or those with thin nails. Fine sanding rings can also be used for finishing and polishing nails after using rings with a higher grit to reduce sharp edges. The spare head allows for the use of sanding rings on the device, ensuring smooth operation. With interchangeable sanding rings, you can customize the grinder to meet your pet's needs, ensuring safe and effective nail trimming. The set includes: 1 grinding head, 4 fine grit sanding rings - 100, 4 medium grit sanding rings - 60. The set is designed for Oster Pet Nail Grinders. Remember, when grinding your pet's nails, it is important to do so slowly and carefully to avoid damaging the nail. Always observe your pet's reaction during the grinding process to ensure it is comfortable.