Product review (5 stars): Very simple, good for the price
I have a really old oven/range. Like so old, there's not even a window into the oven. That being said, it was really hard to explain to someone what I was looking since there was no part number or indication what I needed.

I bought this item on whim since it was cheap enough to see if they'd work. They worked perfectly. There are two different size attachments - I used the longer one with my longer oven knobs. They simply just say off and you can point the metal rim in the direction you need and just pull the sticky stuff off to stick it to the knob.

It may seem tricky at first to line up the knob with the attachment, but just position it whatever direction you need, set it straight down with it still in place (I used the counter and slid my finger out from the edge) and then just give it a firm push and it goes right in.

Just know what type of knob backing you need and expect what you pay for. It's simple, but it works perfectly.