Originally posted by JohnB
Your right is does look different then the one IRS labels:
" 3 Hole 1/12th Scale Clamping Hub - This new advanced design..." and that appears to have a 4-40 screw instead of the 2-56 that comes with the L4 kit:
The screw in the Irs clamping hub is metric (2.5mm). Don't use a 4/40!
The Irs hub is the way to go though, it is the lightest left hub available and very strong.
The CRC hub is bullet proof but needlessly heavy.