These 5 heavy duty fixed castors are made of a heavy duty pressed steel zinc plated, housing a polyurethane wheel mounted on a cast iron centre. This fixed castor wheel runs on ball journal bearings, making the heavier loads easier to move. These castors are suitable for a range of heavy duty applications. Overall height 164mm, load capacity 550kgs per fixed caster wheel, 4 x M10 Bolt Fixing Plate, making these heavy duty fixed castors easy to fix, move and combine 4 castors to carry over 1.5 tonnes castors.