A good start for DIY enlargers. I have a few of these. I don't know what they fit. I was going to use them on DIY 8X10 enlarger head. If anyone knows what they fit it would be nice to know. They are made to take 11x11" clear glass on the bottom. The neg lays on the glass and the top part gently locks an 8x10 AN or clear glass top glass, in 2 orientations. They are 14' wide and 15.25' long. Clean and straight aluminum. The neg fits snugly enough that it would be fine in horizontal or vertical positions. No glass included. $100.00 you pay PayPal fees and Priority shipping.