Solid Rotary Brush System with push button locks. Cable system consists of hollow metal and plastic sheath with solid core wire inside it. 7 brushes of various sizes from 4″ to 18″. Nylon and silica carbide brush bristles. Easy push-button locking brush heads make changing brushes quick and easy. Includes replacement inner core. Available in 7′, 20′ and 33′ lengths. Powered with clutch equipped drill.