THIS KIT FITS RTZ50, RTZ-L50, AND RZT-S50,INCLUDES THREE SPINDLES AND THREE STANDARD BLADES. THE SPINDLES REPLACE OEM PART'S NUMBERS 618-04125,618-04125A,618-04125B,618-04125,918-04125A,918-04125B,618-04126,618-04126A,618-04126B,918-04126, 918-04126A, AND 918-04126B. FITS MODELS: I1050, LT, SLT AND RZT WITH 50" DECK. 6 STAR CENTER HOLE WITH GREASE ZERK AND MOUNTING HARDWARE. THE STANDARD BLADES REPLACE OEM PART #'S: 742-04053, 742-04053A, 742-04053B, 742-04053C, 942-04053, 942-04053A, 942-04053B AND 942-04053C. BLADE SPECS: LENGTH: 18" CENTER HOLE: 3 PT. WIDTH: 2 1/2" THICKNESS: .149" 6 STAR HOLE.