Castor 50mm Lock and Break - Nylon Wheels $15.70 50mm Castors for Motor Mover 300 These castors are "Total Lock and Break". This means that when the break is activated the swivel and wheels are locked. This provides extra rigidity when the breaks are applied. The castors are very tough and can carry 80kg each. The castors are sold individually. Per Motor Mover 4 castors are required. View Customer Feedback List price: $14.00Weight: 0.25 kgDimensions: 80 mm × 60 mm × 80 mmSKU: CN50LB