The Wheelchair Axle Conversion Kit converts a regular 1/2" axle chair to 5/8" axle. The kit comes with Axle, Receiver, Bearings and Bolts with Washers. The Conversion kit turns your 1/2" axle into a stronger axle that is thicker and heavier than the standard 1/2" axle and comes with a Big Button Quick Release. The 5/8" axle is preferred for sports like rugby, basketball, softball, lacrosse or any sport where you have issues bending the standard 1/2" axle. Note: Your chair must take a 7/8" OD Receiver and 5/8" axle.