The replacement part is made of aluminum alloy. Includes top nut, spindle assemblies, blade bolts kit, mounting bolts, grease zerk, pulley locknuts, and sp. Mounting holes are pre-tapped for easier installation. The sp must be installed under the pulley; installing with the sp on top of the pulley or failing to use the sp may result in damage to the shaft and pulley. Compatible with 42 inch, 46 inch, 48 inch, and 54 inch decks. Fits 54 inch P54ZX. Designed for AYP 42 inch, 46 inch, 48 inch, and 54 inch deck lawn mowers with 4 screws: models 187292, 192870, 532187281, 532187292, 532192870, 539112057, 53911207, 587125401, 587253301, 21546238, 21546299, 21549012, 532192870, 532187292, 80-12-001, rotary 11590, 82-026, and others. Color: silver. Material: aluminum alloy. Package includes: 1 x spindle assembly. Only the items listed are included; other products are not included. Note: Light reflection and different display settings may cause slight variations in the color of the item in the image compared to the actual product. Measurement may vary by +/- 1-3 cm.