Heavy duty cross transverse spring pu shock absorbing castor Horizontal spring shock absorbing series-b: Bracket thickness:5.75 mm Polished galvanized surface treatment Lasting light more antirust Riveting technology high loading capacity Wide useful environment Namematerialwheel dia (mm)wheel width (mm)loading height (mm)loading capacity (kg)bearingoffsetplate size plate thickness holader thickness Shock absorbing Caster series-b (transverse spring)rubber with Iron core Nylon with iron Core Pu with iron Core12548217430double 203bearing53hole dia:75*108 Plate:140*114 Plate thickness:9 Plate size:5.75 15048230450double 203bearing53 20048265480double 203bearing72 25048315500double 205bearing95hole dia:76*108 Plate:140*114 Plate thickness:9 Plate size:5.75