Central link with cat 2 hook Central connector with hook and ball cat 2. Parameters: Length min/max - 605/845mm Ball diameter - cat 2 25.4/25.4mm Length of tube A - 420mm Pipe wall thickness 5mm Thread 30x3mm Height H - 51mm Resistance of steel 490 - 630 N / mm ² Hardness of steel 52 - 58HRC Coating Zinc - Fe / Zn 8 CC Crlll (2000/53/EC)