This A-frame 4 Bike park stand is constructed with heavy-duty carbon steel tubing with a powder coated black finish to resist scratches. The internal threads and locking mechanism are high grade steel to prevent untimely "stripping" and looseness and the adjustment wrench is included. No assembly required, this rack is ready to use right out of the box. Great at home or on the go, this rack folds flat (2 ¾") when not in use.