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inside the wheel is the centre bore.. that bore slots onto a 'ring' that sticks out from the hub.. thats why the wheel is held in place while you bolt it up...
anyway, those 'ring' sizes vary on different cars.. so alloy wheels are made with a large centre bore to be used on various different cars/hubs.. the spiggot ring is a plastic ring usually that fits inside the centre bore of the alloy wheel and reduces it down to a smaller size bore for cars that have smaller 'rings' on the hub..
so that the wheel slots on that ring evenly and securely.. then you can line the bolt holes up like you would on a OEM wheel.
PRESS THE SPIGOT RING INTO THE CENTRE BORE OF THE WHEEL MAKING SURE THAT THE WIDEST SIDE OF THE RING IS AT THE TOP AND THE CLIPS ARE IN THE GROOVE.
DO NOT USE EXCESSIVE FORCE AS THIS WILL DAMAGE BOTH THE SPIGOT RING AND THE WHEEL.