im thinking of this for my monopod. would my oben foot fit this? im guessing yes but don't know for sure.

Arca Swiss is a brand that makes large format cameras and tripod heads. They popularized the quick release clamps so now the standard is "Arca Swiss compatible."

Your item is an Arca Swiss compatible screw clamp. It would not work mounted to the top of your monopod as the screw is too large and long. The screw clamp is for mounting to a head. The best heads for monopods are simple tilt heads, some of which come with an integrated Arca compatible clamp.

This is the least expensive Arca compatible tilt head for a monopod that I know and it should work fine:

Benro tilt head

This is a really nice one that would be overkill:


Kirk tilt head

"Your item is an Arca Swiss compatible screw clamp. It would not work mounted to the top of your monopod as the screw is too large and long. The screw clamp is for mounting to a head."

the screw depth on my mono is adjustable...and it can either be 1/4-20 or 3/8-16.

Even if you could get it to mount on the monopod you will have no ability to move the camera. You can experiment with that now by simply screwing your camera on there and taking some pictures. The ergonomics are lacking. If you want to simply have a quick release and you can mount it on the monopod, then go for it. But give yourself one day of shooting that way before you buy a tilt head anyway.