This is a 14mm hex style one way bearing for use with Nitro engine pull starts.
Fits shaft size 6mm - standard on most Nitro engines.
Fits any engine currently fitted with a 14mm bearing, but is standard on the CEN NT engine range and the early Kyoshso 1/10 scale engines.
If you require the 12mm version of this item, please type "bearing" in the search box to bring up all options.