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Hex Wrench Sizes for US Cirrus 4?

Your best bet would be to buy a set at a local tool shop, just make sure there is a small one in the set. You should be able to buy a set which goes from the smallest one (for the saddles) to the big one for the truss rod.

I have never used the allen wrenches that came with any of my basses, just a set a had before.
 
Here's the deal: I have a couple full sets of Allen wrenches. I have had trouble in the past because I thought I had the proper "bite" on a screw, but the screw was metric, and the wrench was standard, or vice-versa. Trying to avoid that with this new Cirrus.
 
Here's the deal: I have a couple full sets of Allen wrenches. I have had trouble in the past because I thought I had the proper "bite" on a screw, but the screw was metric, and the wrench was standard, or vice-versa. Trying to avoid that with this new Cirrus.

Oh I see.....wuss ;).

I havnt had this problem before on 10 different basses and around 20 guitars (sorry if that sounds big headed), but I guess you only need to get it wrong once for it to suck. If it were me I would just do it carefully, there shouldnt really be that much force involved, but that is probably the lamest advice you have been given on TB. Do you have a set of calipers maybe to measure the size?
 
I would go to Harbor Freight and get a big set of metric and a big set of standard. By big, I mean several wrenches covering a wide range. Sets like this will likely include the occasional half size. Keep trying them till you find the one with the tightest fit.