The Kobalt grinding wheels are new in plastic packaging and designed for use with various power tools such as oscillating tools, angle grinders, and rotary tools. With a 5" diameter and 1/4" width, these very coarse grinding wheels are ideal for cutting and grinding tasks. The set includes 4 grinding wheels, making them suitable for multiple projects around the home and garden. Whether you are a professional or a DIY enthusiast, these high-quality grinding wheels from Kobalt are a must-have for your workshop.