a carpenter carefully tightens metal screws into wooden boards using a screwdriver. The screws pull the separate pieces of wood together as they turn deeper into the material. Before fastening, the boards were loose and wobbly, but now they form a solid joint. The carpenter's toolbox shows various other fasteners like bolts, clips, and hinges ready for use. Another worker in the background operates a drill to create holes for more fastening hardware. devices being used to join, attach, and secure different parts together