Ecoguard Dust Collection Cover Type W. Accepts any 5" or smaller diameter blade with 7/8" arbor. Fits most popular high-speed grinders. Rugged construction for heavy-duty application. Alpha® has expanded its Ecoguard line for cutting applications to include a dust collection cover for wider blades. Introducing the Ecoguard Type W. Unlike the Ecoguard Type C which uses a supplied dust collection bag, the Ecoguard Type W must be used with a vacuum, or other dust collection system, to successfully collect the dust and larger particles derived from using wider kerf diamond blades such as the Alpha® Tuck Pointing or Crack Chasing blades. The Ecoguard Type W includes three unique features. First is the ability to easily adjust the cutting depth by using a simple wing nut operation. The second is the nose guide that indicates the cut line and the third is the ability to view inside the cover, while cutting, due to the clear polycarbonate material Construction. This feature is quite useful during Tuck Pointing applications.