This rack is great for holding all of your messy tools; it can hold 6 squeegees or palette knives at the same time.
The rack is adjustable to hold squeegees as small as 3" (smaller than A5) and widens up to 8"( A4 size) to hold larger squeegees. You can use the rack for squeegees larger than A4, but the base itself does not expand any larger.
See pictures for more details.
*Squeegees sold separately. Assembly required.