A neat high quality pair of Billet machined wheel extenders to suit all 5th scales running 5mm pins (Losi 5T/Krakens/MCD) and (baja with HD shaft etcs). The thread of the extender is modelled off the Losi/kraken thread.
 
These extenders have a nice little design feature of encapsulated pins with grub screws. So the pins never come out and no ugly rubber rings around the pins to retain them!
 
Fairly chunky and not the lightest on the market as made from top of the range 2024 aircraft aluminium (look it up, awesome stuff for RC -  arguably superior to the more brittle 7075).