THIS KIT INCLUDES THREE SPINDLES AND THREE BLADES. THE SPINDLES REPLACE OEM NUMBERS ARIENS: 21546238, AYP: 187292, 192870, 532192870, DIXON: 532187292, 532192870, 532187281, 539112057, MCCULLOCH: 532 19 28-70 AND POULAN: 532192870. SPINDLES FIT MODELS AYP 46", 48" AND 54" DECKS. SPECS: HEIGHT: 7 1/4" 5 PT STAR SHAPED BLADE MOUNT. GREASE ABLE. MOUNTING HOLES ARE THREADED AND COMES WITH MOUNTING BOLTS, PULLEY NUT, SPACER, AND BLADE BOLT. THE MULCHING BLADES REPLACE 187255, 187254, 187256, 532187256 AND R12121.Warning:Lead-Nickel-Cancer and Reproductive Harm