Both sizes are highly recommended for switch lube use. #3 are perfect size for switch bottom housing rails, while #1 great for lube sliders, bottom housing spring mount, and springs.
I was beyond impressed with the paint brushes offered by keys. It was really nice and lubing was really easy with these brushes. I'd highly recommend it.
Well its just a standard paint(lubing) brush nothing interesting but it does its purpose well enough
Nothing fancy, it just work