CQG S1 from china quality goods is a sleek SS keychain light. comes with NW tint. Only 1 mode, but IMO that's fine for a small keychain light. There's also the S2 for AA.
I have an Olight I2 on one keyring and a blackcat on the other. The blackcat is smaller and throws better, the olighit has three modes and lights up a room better. The Olight has never required any maintenance, but I have had to disassemble/clean/retighten the blackcat several times.
Oh, and the Blackcat is red and matches my 2004 Mustang, while the Olight is black....
Fenix E05. it's my keychain light. i've extolled the virtues of this light many times. it's simple, sturdy, and the brightness and runtime are just about right IMO for a keychain light. the best thing on it is the really tight threads. a lot of the lights in this segment, the iTP A3/Olight i3 and Lumintop Worm included, have sloppy threads and the heads have to be twisted a half turn to lock out. the E05's threads are so tight that even a tiny fraction of a twist will turn the light off and lock it out. this makes one handed operation really smooth and easy - something that comes in very handy when i'm carrying stuff in my off hand. it also has excellent knurling which also helps with easy one handed operation. it's an awesome light.
I have never had anything besides a "button" light on my keychain, until the Tank e09. I have a 10440 battery in it and it puts out a readlly bright little beam. It also has three modes and I have already been glad for a low mode on my keychain light.
I have dropped it twice to the ground and escaped with only a nick in the finish. No function issues.
This is the very new Bronte RA01 in stainless steel from the even newer and unknown brand BRONTE, so there are no experiences out there with them. Better get a well known and thoroughly tested light unless you feel especially adventurous or want to be the first to write a review about it. They are probably not bad, because SBflashlight also added them to their arsenal. I would like to get my hands on their 2AAA penlight with clicky and 3 modes one day.