A few tuning keys

The all-metal one came with a ukelin, and is not a 'perfect' square ...but the pegs on the ukelin are not all exactly the same either,...weird.

I use the largest wooden T key 98% of the time,,,fine control, and it fits well. It and the longest one have octagonal holes, so they are quite accurate & snug,,,and I find it is easier to control than the long one. The others work, but have a bit of play in their fit. (I have a 21 bar Schmidt 'harp for most stuff, but also an old Sears Golden Harp and a Chromoharp....and a 1900 Zimmerman, with shifters. Some of those need the odd tuners,)