Twin grinding heads are driven by heavy-duty gearboxes ensure high productivity and reliability. An adjustable dust extraction skirt provides dust-free operation when used in conjunction with the dust extraction vacuums. The operator's handle is fully height adjustable. The DFG 400 is supplied fitted with 2 no. standard drive plates allowing the floor grinder to be used with carborundum blocks, wire brush blocks and diamond blocks all held in by wedges.