heavy-duty mixer with 1-3/4 in Dia to fit through pour spout of 5 gal containers. Mix drywall compound, driveway sealer, paint and more in 1 to 5 gal containers. Welded steel with hexagonal shaft for positive chuck engagement. Electrostatic paint coating for easy clean-up and corrosion resistance. 1-3/4 in Dia, 3/8 x 19 in shaft.