Please see the table for the Allen Key part numbers
 
Below is a list showing what each Allen Key is used for
 
3mm - VM90/100 Chuck Jaws
4mm - VM120/150 Chuck Jaws
5mm - Eccentric Chuck or Bowl Jaw Grips 
8mm - VM90/100 Chuck
10mm - VM120/150 Chuck
8mm Long Length - Perfect for VM90/100 Bowl Jaws as the clear the large diameter
10mm Long Length - Perfect for VM120/150 Bowl Jaws as the clear the large diameters