This new, ergonomically designed sanding block measures 2-3/4" x 7-3/4" (70 x 198 mm) and makes it easier to finish flat surfaces. The MVHB38 sanding block can easily be attached to the MV-912 Dust Extractor using a standard 3/4" vacuum hose. A grip attachment system for use with Mirka’s unique net abrasives means that material is extracted quickly, providing a dust-free working environment. The suction valve can also be adjusted for reduced or increased vacuum.