This shade is a stunning piece. It is heavy & the glass beaded effect around the top & bottom is stunning It is very tactile with the white design being very tactile like sugar & is very old probably 1940 or 1950 Looks great as a ceiling light but could be used on a lamp I can only say study the photos to see it’s beauty. Though the quality of the pattern & fluting can’t be seen its so much better in real life It is quite heavy much thicker glass than similar ones I have listed. Hole 4 cm across I have used a spacer to make it fit a ceiling rose which I can include if you ask. This brings the hole down to 3 cm it can be seen in one of the photos it is white metal Bottom 11 cm across 17 across the middle approximately it’s harder to measure 15 cm tall I have 10 of these shades available Amber Champagne Medium Coloured Gold Swirl Frosted White Pattern Glass Light Shade Retro Vintage Kitch Excellent 1940 Or 1950 Mid Century