Re: Allen key size for Ibanez Jem77p-bfp
You are correct, as those are all quality brands. EVERYTHING else you will find on the market is going to be made in china POS. I know because I buy generic wrenches from AAA Metric for stud mods kits or giveaways because factory wrenches are $5 each. The 1.5 won't even tighten a stud set screw, it starts slipping. The 4mm's are pretty close though.
Bottom line is every wrench is not created equal. Buy a cheap wrench and most likely you don't have perfect sizing, and in soft parts it makes a BIG difference.