The Vanquish Products Axial RBX10 Ryft Axle Spool/Locker is a simplified upgrade that replaces the stock plastic diff cup and spider gears with a one piece spool that eliminates the differential. Machined from high quality US chromoly steel and heat treated to create a durable and long lasting product. Package includes one spool. Note: Does not include bearings, hardware, gears, or other related components.