Description Features a double ball bearing head race with hardened shims and plastic seal, which ensures a smooth swivelling action and long life. A flat washer is pressed on the headrace for flush mounting. This also keeps out dust and water. Ideally suited for trolleys using expanding tube fittings or single bolt mount. 10mm also available. Used in a large range of applications in hospitals, institutions, bakeries, retail displays and workshops. Wheel options available <150>– grey rubber, blue resilient rubber, nylon.