I've got 4 sets of these blocks with the only identifying marks being CU350, CU400, CU500 & CU650. They have mirror polished hexagonal sections of various sizes in the centre section ... hence the different numbers. My theory is some sort of hammer mill maybe.DSCN1252.jpgDSCN1251.jpg

The other piece looks like it goes in a lathe tool post and has a universal type joint with a collet for holding the shafts which also screw together. This one I'm really lost on.DSCN1253.jpgDSCN1254.jpg
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