The Single row with three columns is the largest single row folding chair trolley we offer, if you need anything that holds more chairs then a double row option will suit your needs. The entire range of our folding chair trolleys are manufactured using heavy duty steel frame construction. The frame is powder coated in black and gives it a fine finish while also protecting it from the elements. To secure the folding chairs in place there are four swivel castors and the two have brakes which secures the chairs and keeps them in place when moving and storing your event furniture. The entire folding chair trolley range requires basic assembly. As with all trolleys on our site we recommend you check that the size of your venue or storage area has sufficient clearance to allow the trolley to turn. More importantly check the sizes of your door to be sure that the trolley fits through with enough clearance. If you have any questions regarding any products sold on our site please give us a ring or contact us through the chat function and one of our specialists will help answer any and all of your questions.