Those lowly nuts and bolts, aka Hardware, have had quite a decorated history in skateboarding. Some of the biggest companies in the industry started out as hardware and now have their owners flying to the skateboard shindig in private jets.
Cruiser boards usually vary in shape from traditional street boards and can vary widely in width, but generally are shorter than about 34 inches. Cruiser completes come with softer wheels, too. Softer wheels are an easier ride. Cruiser boards are generally not for doing tricks. They're transportation like longboards, but don't have the uncool factor that longboards got stuck with from the street skaters.
Hardware are the nuts and bolts you need to put your skateboard together. They attach the trucks to the board. You'd think it would be a boring category, but some of the biggest companies in skateboarding started in hardware.