This is a 25mm diameter mild steel bung which has been coped to fit perfectly on 1-1/8" diameter tubing. It will also fit on 1" and 1-1/4" tubing without too much persuasion. The depth of the centre measures 15mm.
It has a 5mm hole running right though it. The reason for this is to make it versatile. You can drill and tap it out to any thread pattern you like, or you could weld a rod in there to do who knows what. The possibilies are endless.
