Cyclo ‘Y’ Wrench Ball Ended Allen keys 4, 5 and 6mm AND Cyclo ‘Y’ Wrench Allen keys 2, 2.5 and 3mm
I was using the Allen keys everyday without issue. We were at the Eddie Mercx velodrome three days per week and I was constantly using them to change bars and stems from pursuit to bunch racing for ten riders each day. No wear at all on the ball ends.
I have to say they really are a great product.