this Disc Harrow Spacer Spool Works With A 1-1/8 Inch Axle. The Spacer Is 7-1/2 Inches Long And Made Of Grade 30 Steel. Specifications Plain Spacer Spool Fits 1-1/8 In. X 1-1/8 In. Square Axle Length: 7-1/2 In. Grade 30 For Other Disc Harrow Axle Parts...