Gifford Wood Attrition Mill. S/N: QV6-2-6903. Reduces particle size by rubbing. The rotating impeller over a stationary plate combination produces the tight gaps needed to reduce the particles down to size. Dry or wet material handling. Impeller diameter: 3 in. Electric motor. Inlets: (1) 1/2 in. dia. return pipe. Outlets: (2) 1/4 in. dia. barb fittings. Overall dimensions: 15 in. L x 12-1/2 in. W x 39-1/2 in. H.