I was thrilled to see they were finally listed for ProverXL. I received a box with the same item number as listed on the Sainsmart website. Both Amazon and Sainsmart list this as a new clamp for the 4030XL checker. The T-nuts are way too small for an XL proofer with an official aluminum base. They also do not match what is shown in the picture on the website. They don't fit in the slots. It's like trying to give SainSmart a good rating but they keep self-sabotaging. Good clamps except they don't work with the 4030XL tester.