Keychain Bit Driver

Just a little keychain that holds a 1/4 inch bit and screws closed. I've seen a few similar designs here and products online, but I decided to make one that was a little slimmer and, in my opinion, sleeker; I really tried to make something that's nice to hold and look at. When it's fully screwed closed, the seam almost disappears, and some sanding could probably make this thing look real nice.
I designed this with the Leatherman Squirt PS4 multitool in mind, so the hole for the key ring works best with the little keyring included with the Squirt. Furthermore, the slot is designed to fit the file or flathead on the Squirt, though I'd assume similar tools from other small multitools would also fit. The purpose of the slot is to provide a little more leverage on tighter screws, as shown in the pictures. At the moment the fit is pretty true to the Squirt tools, but it wouldn't be very hard to widen that slot to accommodate a key or something similar instead.
As far as the fit of the bit,