Size:70x 400mm size of this Use: Sanding Block makes it perfect for putty sanding . Holes:14 The 70x 400mm size of this Hand Sanding Block makes it perfect for putty sanding because it reduces the risk of tilting during use. There’s an easy to access 20mm hose connection and an adjustable suction valve to allow for optimised dust extraction and air flow and help the tool move easily over the ...