VEXpro VersaHubs - VEXpro 217-2591, These plastic VersaHubs from VEXpro provide frustration-free torque transfer between wheels, gears, sprockets, and shafts. You have a 1/2in Hex you need to put a plate sprocket on? No problem. Need to mount a 64-tooth gear to your Mecanum wheel? You can do that too.Whatever your need, these hubs will help you integrate everything together seamlessly. Most of the wheels and sprockets that teams typically use, including the previous generation of VEXpro wheels, don\'t take piloting into account, but with these everything pilots correctly every time. Wheels, hubs, gears, sprockets: they all work together.VersaHubs include the innovative VersaKey mounting system. VersaKeys transfer torque between coaxial items, and also ensure everything is piloted correctly. VEXpro 217-2591 VersaHub 1.125\" Bearing Bore Spacer 1/2\" Wide Plastic