Fits any base with a steel rod, they are made of aluminum, impeccably painted in black, screws with metric blue plastic tap M6. They are very precise, they have no play. Initially I thought that the price did not justify the product, but I was wrong. They come carefully packed, each separately in its own bag. At the time I bought them, they were even on sale. I am tempted to buy another set, you never know when you will need an extra clamp in the next experiment.