Vacu-Guard™ Dust Containment System Universal Dust Shroud Shrouds for 7" & 9" grinders: Designed to fit 7" and 9", 15 amp grinders, up to 7" cup wheels: Milwaukee, Dewalt, Metabo, Hitachi, Makita, and Bosch Included with each shroud: Shroud clamp, Shroud spacers (5) Vacuum port size: 2.25" ID; 2.65" O.D. Shrouds for 4-1/2" & 5" grinders: Designed to fit 4-1/2" and 5" grinders: Milwaukee, Dewalt, Metabo, Makita, and Bosch Included with each shroud: Shroud clamp, Shroud spacer (1) and washers Vacuum port size: 1.75" ID; 2.0" O.D.