These 160mm extra heavy duty swivel castors are 200mm overall height, 4 x M10 Bolt Fixing Plate, housing made of a heavy duty pressed steel zinc plated, with a 6 (160mm )polyurethane wheel on a cast iron centre. This swiveling castor wheel runs on ball journal bearings, making heavier loads easier to move. These 6 castors are suitable for a range of heavy duty applications, as the polyurethane wheel is hardwearing and durable able to carry 700kgs each castor. Combine four to carry 2 tonne castors *  Heavy Duty 2 tonne Castors  - when combining 4 Castors*  Cast iron and polyurethane castor wheels*  In stock ready for dispatch!