Contouring Block, external face 30mm radius, internal face 28mm radius EXTRA EXTRA COARSE. Dims. 280 x 47 x 52 mm approx. Tungsten carbide grit abrasive rubbing block, tough and long lasting. Popular with Stonemasons and for brick / block work. Roughing out block. Ideal for under cambers, grooves and fillets, rounding edges and corners. Limestone, sandstone, bricks, breeze block etc.