ProMaster ステップアップリング（40.5mm→46mm）

Fits my 40.5mm lens perfectly and converts to 46mm without any wobble or cross-threading. The machining is clean and the ring spins on smoothly, which is all I really needed for my filter setup.

Fits perfectly between my 40.5mm lens and 46mm filters with zero wobble. The machining is precise enough that it doesn't add any noticeable vignetting.

Machined threads are smooth as butter, no grinding when I twist it onto my lens, and the step-up lets me use my bigger 46mm filters without any vignetting. It’s a solid little ring that feels sturdier than the cheap plastic ones I’ve had before.