The Dust Muzzle is the original, ingenious design that is perfect for preventing the annoying and dangerous dust from grinding your tops. Designed to fit all 4-5 inch and 7-8 inch grinders, when attached to your industrial vac, it is the most effecient and durable dust muzzle available for angle grinders. Minutes to attach, connect to your vac with the available 4ft hose, and you off and running. This fits your 7-8" grinders.