* How do the American shanks compare with the European? In general they are slightly smaller all around:
• American shanks are slightly smaller at the leading end (approx 13.4mm vs. 13.78mm for the Euro).
• American shanks are slightly smaller at the cup end (approx 15.38mm American vs. 15.8mm Euro)
• American shank length is longer at 48.6mm (Euro is 41.7mm).
• American shank has a slightly slower taper than Euro (approx 2.0/100 American vs 2.4/100 Euro).