The HERZO dust cover will make working with your angle grinder much cleaner and safer. This cover fits most 4“, 4.5” and 5” angle grinders. What's really cool about this cover is its swivel slide cover design. It allows you to easily reach all the way to the edge of the wall, while still effectively collecting dust. It comes with 4 clamp washers of varying thicknesses, allowing you to securely mount the cover to almost any compatible power tool. The clamping system provides reliable fixation - nothing dangles and does not fly off during work. The main purpose of this cover is to collect harmful dust when sanding surfaces. Plug in a vacuum cleaner and most of the dust will go straight into it instead of flying around the room and settling in your lungs.