Wheel Hex

[Deathpion]

Hi! I'm curious as I saw some people running their preds with hex wheels, so I was wondering where they get the hex adapter from. I've been looking around but can't find any. It's not those clamp type but those which has set screw on them. The original wheels I have on my pred always crack and I have lots of Kyosho wheels which I like to run on the pred. Any refference would be mush appreciated. Thanks.