Carpenters possess skills and perform work that is basic to most building construction. They will erect wood and steel frameworks in buildings; build forms for concrete; and erect partitions, studs, joists, drywall, and rafters. Many Carpenters work indoors to install all types of floor coverings, ceilings, paneling, trim, and interior systems. They must be very skillful as "finish" work is visible and often involves expensive materials. All Carpenters use a wide variety of hand and power tools, and they must be able to maintain their tools in good, safe working order.