Here at Castle Hubjub even our toe clips are NJS certified. Really! You can see the mark on the front of the plate. MKS include a little baggy with every set containing not only decent steel mounting bolts but also an allen key. That's a nice touch and it arguably makes these a better bet than the bubblepack jobs at yer LBS.
Medium is 36-40EU so anything less than a size 6
Large is 40-44EU so sizes 6-9
X Large is 44-48 size 10+
SOLD IN PAIRS