[2H-04S: Second side width: 4mm]
[2H-07S: 2nd side width: 7mm]
[2H-05S: Second side width: 5mm]
[2H-10S: Second side width: 10mm]
[2H-03S: Second side width: 3mm]
[2H-08S: Second side width: 8mm]
[2H-2.5S: Second side width: 2.5mm]
[2H-06S: Second side width: 6mm]
By inserting it into the ratchet handle, you can quickly tighten the hex hole bolts.