Wow! A bunch of crybabies all of you! This is a standard set of clamps. The slot size is 7/16", CLEARLY marked on the header. Yes, they can all rust. They are sintered metal. All blackish machines MUST be oiled. The mold is how this type of clamp set has been made for decades. Every one of them to machine would increase the price by a factor of twenty Measure the machine bed and then order a correct size set It's time for the mill Stick on Buy some WD40 or better yet KROIL to spray on your ferrous metal tools to set them up to protect against rust.
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