Hammond 1441 Series Steel Chassis with Walnut Side Panels – Hammond 1431-30BK3, The Hammond Steel Chassis Bottom Plate, Black 1431-30BK3 (422 x 203 x 1mm) are spot welded, heavy-duty construction steel chassis with black powder-coated finish and walnut end panels. Hammond 1431-30BK3 Steel Chassis Bottom Plate, Black (432 x 253 x 1mm)