Extremely fine tip, about 0.2mm. Overall length about 68mm. The end that attaches to the bottle is about 5.25mm. The bottle end can of course can be cut down to fit the CA brand bottle you are using. The plastic is soft, and easy to cut with a sharp knife. I had to cut off about 7mm to fit a 2 oz Mercury CA bottle. The taper is gentle, so by cutting down the barrel it will fit almost any major maker's bottle. This tip will only work with thin CA. Medium or thicker will not flow very well, if at all.