OTT-JAKOB gripping Clamping Tool 95.101.874.3.2 71911 lot of 3

OTT-JAKOB gripping Clamping Tool 95.101.874.3.2 71911. One price is for all 3. I do not know much about these. The seals may be worn? Came out of a lot of Cincinnati spare parts. One has a few gouge at the end, the other 2 look like in good condition. Item file location 03-135415 sblb11.