This model has black wheels.  The No. 1 Terracer was introduced in 1931 to help farmers add terraces to their fields. Terracing, a conservation practice used to help reduce soil erosion, became much more common during this time as farmers tried to combat the ?Dust Bowl? conditions prevalent during the Great Depression era. Production of the No. 1 Terracer lasted until 1941, making it the most popular and longest running part of a line of Caterpillar® agriculture implements, which included a hay mower, hay rake, and multiple-implement hitch. The gooseneck hitch, coupled directly to the tractor drawbar, made the Terracer more maneuverable than traditional pull graders. The No. 1 excelled at filling gullies, clearing fence rows and building irrigation ditches, in addition to terracing. The 1400 lb. weight and 8? wide blade of the No. 1 made it well suited for Caterpillar Ten, Fifteen, Twenty, Twenty-Two, Twenty-Five, R2 and D2 tractors, as well as tractors of other makes between 10 and 25 drawbar horsepower.