Case IH Windrower Draper Headers DH3 series make quick work of big acreage, with double-knife and double-swath options. The heads are compatible with all Case IH WD3 Series II and WD4 windrowers. With model options from 25 to 40 ft cutting widths, 1 or 2 Sickles, 1,400 spm Sickle speed and a 2-8 degree angle range. Making your maximum cutting ...