John Duff our highly trained steel fabricators produce almost anything out of mild steel, stainless or aluminum. Check out our photo galleries for tanks, header boxes, trailers, custom stairs, pipe clamps, hoppers, electrical boxes, tank repairs & you name it! Serving Sarnia, London, southwest Ontario for almost 50 years. Call or email us today!; Clamps; Cones; Fabrication Services; Forming Services; Pipes; Rails; Rolls and Rollers; Shearing Services; Stairs; Transitions ...