These extra heavy duty fixed castors contain a 5 (125mm) fixed rubber wheel, overall height 164mm, load capacity 300kgs each, 4 x M10 Bolt Fixing Top plate castors are made of a heavy duty pressed steel zinc plated, housing a solid 5 rubber wheel mounted on an aluminum centre. These fixed castors wheel runs on ball journal bearings, making the heavier loads easier to move. These castors are suitable for a range of heavy industrial applications and can be teamed up with locable castors or swivel castors.