31 Spline Ultralite 9" Spoolspool, Ultra-Lite, Fullsize, 31 Spline, Steel, Black Powder Coat, Ford 9 In, Eachthis Spool Is Machined For A 1.780 I.D. Carrier Bearing Commonly Used In 2.893 And 3.062 Cases. Spool May Be Used In 3.250 Cases When Used With Mwe57510 Spool/Carrier Shim Set Which Increases Carrier Bearing O.D. From 1.780 To 2.00 To Install Bearings Used With 3.250 Cases.Product Lineultra-Litefull / Minifulllightweightyesscallopednoweight6.1 Lbsaxle Splines31Case Carrier Bearing Diameter1.78 Inmaterialsteelcolorblackfinishpowder Coatquantityeach