Allen Speed Skate Wrench - $20.00
The blue 4mm wrench is a bit larger then the red 5/32 wrench. I use the larger blue 4mm wrench for boot bolts and the smaller red 5/32 wrench for frameaxles. If I try to use the larger blue 4mm wrench for frame axles it will fit a bit tight and may and get stuck. If I try to use the smaller red 5/32 wrench for boot bolts it fits a bit sloppy and may strip the boot bolt head. Again, the larger blue 4mm wrench works great for boot bolts and the smaller 5/32 wrench works great for frame axles.
