If the key didn't suck, they would be fine.
I have a 19mm thin wall deep impact socket that works great on the RPF1s... Gold anodized and everything. Part of a 3 piece set from......
You guessed it....
Harbor Freight!
I can't find the anodized ones, but an ugly black set is only $9.
http://www.harborfreight.com/cpi/cta...emnumber=40036
The colored sleeves come off for really tight spaces.