Pearl Standard Vacu-Guard for Angle Grinders Features Durable and effective dust containment system. For grinding only Pearl's exclusive flexible diaphragm allows the operator to adjust the grinder angle without sacrificing dust containment efficiency A special Delrin seal strip allows the unit to flow easily over a variety of surfaces Heavy duty aluminum casting Lightweight, long lasting and durable Optional carbide wear Pads, protects the Delrin slide from excessive wear, thus increasing life Adjustable Hub Adapters. Able to adapt to a variety of angle grinders 4-1/2" Vacu-Guard has 1-1/2" vacuum port 7" Vacu-Guard has 2" vacuum port