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Customer questions & answers1.Q：how long are the screws it comes with? A:Generally M10*15 2.Q:Is it possible to order two that swivel and two that don't? swivel? 3.A:Yes, there are two types of caster,Swivel and fixed. Q:Can these castors be used outdoors? A:Yes, it is depends on your requirements for caster size and load capacity.