1.Q:how long are the screws it comes with?
A:Generally M12*25
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 Swivel with brake.
Q:Can these castors be used outdoors?
A:Yes, it is depends on your requirements for caster size and load capacity.
4.Q:What’s the wheel dia of the casters?
A:There are 3 to 5 inches