Machine description: CAT PART NUMBER 583-4538, CATERPILLAR 4 TOOTH PRO PLUS THUMB, FOR PIN ON ONLY, MESHES WITH 42" BUCKETS GD (552-8209), HD (552-8239), SD (552-8251), PINS AND CYLINDER INCLUDED, SOLD AS IS... more info about the Caterpillar 320/325 FULL ROTATION 4 TOOTH THUMB.