Here's a photo with the Leatherman Micra(mine's been bent), Swiss-Tech Utili-key, and the small driver from my Leatherman Wave. The Utili-key is the smallest and just barely is able to fit in the screws on my eyeglasses, the others are just too wide/thick to fit. I didn't have my SAK mini-driver handy, but it's close in size to the bit from my Wave, and the Squirts is similar to the Micra. You can find a Utili-key for under $10, Target carries them. It hides on your keyring until you need it. The only problem with the Utili-key is that it's a really short driver, and if the screws on your eyeglasses are recessed, it might not reach. The screws on mine are at the arms and nosepads, so it works for me.