So nice not having to carry my lock in my bag anymore. I don't know if this info is helpful for anyone else, but I use the "Kryptonite 18mm New York Fahgettaboudit U-Lock Mini" and it fits perfectly. I know they rec the Evo 5 Mini but the locks are roughly the same size I guess, and I prefer the NY lock around the city.
I got this at the same time as the leather pocket pannier to go on my rear rack, and they both add such a nice touch to the bike. The leather color matches my brooks saddle perfectly, and of course the u-lock holster saves me from having to ride with my lock in my back pocket. It's perfect.
I just got the U-lock holster and it is so awesome. I'm a huge Walnut fan and it matches my Bullwhip tape, frame handle, and Brooke's Saddle to a T. Wonderful craftsmanship and just one more thing for me to praise from this company.
What amazingly beautiful products Walnut Stuidolo has to offer - I gave a couple of items from them to my boyfriend for Christmas and he absolutely loves them.
I cannot thank Geoff & Valerie enough for such a great company and work ethic.
The holster looks great. I bought a Kryptonite Evo lock to use with it since it was designed around it. Fits great except that my lock flies out of it if I hit a big bump. I have zip tied mine in with a multi-use zip tie to prevent this. Otherwise I love it.