digger: 1,fit for 15-30hp tractor 2,Widely used for digging in garden and field 3,Auger Dia is 6", 9", 12" 4,european style POST HOLE DIGGERSMODELJW-PD20Tractor (hp)15~30HPAuger Flighting Thickness6mm4mmAuger Dia6",9",12"Auger Pipe63mm O.D.73mm O.D.Hitch Cat1Boom Tube73mm O.D.63mm O.D.Yoke Tube73mm O.D.63mm O.D.Driveline Cat2Gearbox540RPM3:1Ratio,operating RPM:300Weight120 lbs.(Without Auger)