The two sizes listed in the product name (0.556" OD, 3/8") are correct but the photo is not. I expected the flange to be about 3/4" diameter in the photo and the overall length about 3/4" - 1". I rely on the photo (now I know it's in stock ). Otherwise it appears to be a quality product. It just doesn't work for my intended use as the dimensions are not what I expected. I am posting a picture and diagram of the actual product for other interested parties.